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Calm · Lots of talk

Physiological sigh

Also called double inhale · physiological sigh breath · huberman sigh · cyclic sighing

Community talk. May contain inaccuracies. Not medical or health advice. No result or safety is promised.

A physiological sigh is a double inhale followed by a slow, longer exhale. Repeating the pattern is called cyclic sighing. People use it as a brief pause when they feel tense; research suggests possible benefits for mood and anxious feelings, but it does not guarantee instant or lasting calm.

Stanford Medicine · 2023

01

What the breathing practice involves

One inhale, a small top-up, then a slow exhale. In the studied version, people sit or lie down, inhale through the nose, add a shorter second inhale without breathing out first, then slowly exhale through the mouth. The longer out-breath slows the sequence. There is no breath hold to count.

Cell Reports Medicine · 2023

Five minutes was the daily study routine. The Stanford comparison used repeated sighs for five minutes a day over a month. That is a different amount of practice from an occasional sigh before a difficult moment, and it is not a minimum everyone must complete.

Stanford Medicine · 2023

Comfort matters more than force. General NHS guidance for calming breathing emphasizes a comfortable position and gentle breaths, only as deep as feels comfortable. Straining to fill or empty the lungs is not the goal.

NHS · 2026

02

Potential benefits

A short-term reduction in anxious feelings. A small 2026 student study found that one minute of cyclic sighing reduced self-rated anxiety more than continuing as usual at the five-minute follow-up. Box breathing helped too. The study does not establish how long relief lasts or whether one breath can end a panic attack.

Anxiety, Stress, & Coping · 2026

Better mood with regular practice. In the 2023 trial, daily cyclic sighing improved positive feelings more than the same amount of mindfulness meditation and lowered average breathing rate. Anxiety improved in both groups; sighing was not clearly better for that outcome.

Cell Reports Medicine · 2023

03

Good to know

Too much breathing can cause dizziness. Breathing too deeply or rapidly can lower carbon dioxide enough to cause lightheadedness, tingling or a pounding heart. Those symptoms are a reason to stop forcing the exercise, not finish a breath count.

MedlinePlus · 2024

Better sleep and a lower resting pulse are unproven here. The 2023 trial found no clear improvements in sleep or resting heart rate. Feeling calmer after a sigh is not proof that a sleep or heart problem has been treated.

Cell Reports Medicine · 2023

New breathing trouble needs assessment. New unexplained rapid breathing, especially with chest pain, needs urgent medical assessment. Repeated or worsening panic symptoms also warrant professional help rather than relying only on a breathing exercise.

MedlinePlus · 2024

04

From community discussion

Brief pauses and temporary relief

A few breaths at a desk. People describe one to five rounds before or after a tense moment, then returning to the task. They describe a short pause rather than a long meditation session.

Community

Before a presentation. Sahil Bloom reports that sighing helped him before big presentations, though he paired it with power poses. His X thread also promotes his newsletter.

Community · X / Thread Reader mirror

Relief can fade when the breathing stops. One poster felt better during the exercise but said stress returned seconds later. A reply described it as a way to notice a stressful thought loop and relax tense muscles; another preferred box breathing.

Community · Reddit/r/HubermanLab

Bedtime and early-morning worry. One person describes using sighs when their mind races in bed or anxiety rises after a 4 a.m. awakening. Another uses it before sleep on workdays. These are reports of settling, not measured improvements in sleep.

Community · Reddit/r/Menopause

Forceful breathing, lightheadedness and no advantage

A forceful exhale can feel less calming. A poster reported a higher heart rate when forcing the breath out; a respondent found a relaxed, extended exhale most calming. Their distinction was how much effort the breath took, not simply how long it lasted.

Community · Reddit/r/HubermanLab

Lightheadedness after a forceful top-up. Accounts also describe lightheadedness when people make the second inhale too forceful. That uncomfortable feeling is part of the community record, alongside the reports of quick relief.

Community

Some find no advantage over other breathing. One poster found no extra benefit over belly breathing. Replies included no benefit from sighing and a preference for 4-7-8 breathing. Even people interested in breathwork describe different favorites.

Community · Reddit/r/HubermanLab

References for this topic

Sources and context

  1. Brief structured respiration practices enhance mood and reduce physiological arousal ↗

    id
    self-guide-sigh-cell-2023 — Brief structured respiration practices enhance mood and reduce physiological arousal
    platform
    Cell Reports Medicine
    role
    Professional context
    accessed On
    2026-09-24
    locator
    Cyclic sighing method in the 2023 Stanford trial
    scope
    The paper describes cyclic sighing as a double inhale followed by an extended exhale, practiced for a few minutes a day in a controlled comparison.
    limitations
    One study in volunteers. It does not treat panic disorder, replace therapy, or set a dose for dizziness or heart disease.
    slugs
    • physiological-sigh

  2. Breathing anxiety away ↗

    id
    self25-physiological-sigh-stanford-2023 — Breathing anxiety away
    platform
    Stanford Medicine
    role
    Professional context
    accessed On
    2026-09-27
    published Or Updated
    2023-06-02
    locator
    Opening explanation; practice description; study routine and questionnaire findings
    scope
    Institutional explanation of the double inhale and slow exhale, the month of daily five-minute practice, and mood/anxiety findings.
    limitations
    Institutional coverage of its own researchers' trial; headline language is stronger than the outcome-specific claims used here. It does not establish reliable instant or lasting relief for everyone.
    slugs
    • physiological-sigh

  3. Brief structured respiration practices enhance mood and reduce physiological arousal ↗

    id
    self25-physiological-sigh-trial-2023 — Brief structured respiration practices enhance mood and reduce physiological arousal
    platform
    Cell Reports Medicine / PubMed Central
    role
    Professional context
    accessed On
    2026-09-27
    published Or Updated
    2023-01-10
    locator
    Results on mood, anxiety, respiration and sleep; STAR Methods, Description of breathing protocols, Cyclic Sighing; Limitations
    scope
    Breath sequence and position; mood and breathing-rate benefit relative to brief mindfulness; no superiority for anxiety and no clear resting-heart-rate or sleep improvement.
    limitations
    Small exploratory remote trial with a mostly student sample and health exclusions; adherence was imperfect. Wearable outcomes are group research measures, not diagnoses. The paper separates online publication on January 10 from collection date January 17.
    slugs
    • physiological-sigh

  4. Breathing exercises for stress ↗

    id
    self25-physiological-sigh-nhs-comfort — Breathing exercises for stress
    platform
    NHS
    role
    Official context
    accessed On
    2026-09-27
    published Or Updated
    2026-06-12
    locator
    Comfortable position and numbered instructions 1–4; page-last-reviewed date
    scope
    General calming-breath guidance emphasizes comfort, gentle breathing and avoiding force.
    limitations
    This page describes a general breathing exercise, not a trial or NHS endorsement of the double-inhale protocol. Its year is a verified review date.
    slugs
    • physiological-sigh

  5. Simply breathing anxiety away? A pilot, just-in-time ecological momentary intervention study of one-minute cyclic sighing versus box breathing as tools for acute anxiety reduction and attention promotion in real life ↗

    id
    self25-physiological-sigh-minute-trial-2026 — Simply breathing anxiety away? A pilot, just-in-time ecological momentary intervention study of one-minute cyclic sighing versus box breathing as tools for acute anxiety reduction and attention promotion in real life
    platform
    Anxiety, Stress, & Coping / Catholic University of Eichstätt-Ingolstadt repository
    role
    Professional context
    accessed On
    2026-09-27
    published Or Updated
    2026-04-19
    locator
    Publisher PDF cover and abstract; Results and interpretations; Limitations and future directions; DOI 10.1080/10615806.2026.2659809
    scope
    One-minute cyclic sighing and box breathing were associated with less self-rated anxiety at a five-minute follow-up than a passive control during students' everyday anxious moments.
    limitations
    Pilot in young, healthy students; expectations and unverified technique may affect findings. Duration beyond follow-up is unknown. Attention efficiency did not improve. Full text read through the university repository after publisher access failed.
    slugs
    • physiological-sigh

  6. Hyperventilation ↗

    id
    self25-physiological-sigh-medline-overbreathing — Hyperventilation
    platform
    MedlinePlus Medical Encyclopedia
    role
    Official context
    accessed On
    2026-09-27
    published Or Updated
    2024-07-23
    locator
    Considerations; symptoms; Home Care; When to Contact a Medical Professional; Review Date
    scope
    Overbreathing lowers carbon dioxide and can produce dizziness, tingling and a pounding heart; new or worsening rapid breathing may need urgent assessment; anxiety/panic can require professional care.
    limitations
    General clinical information, not a cyclic-sighing adverse-event study. It cannot identify the cause of a forum poster's symptoms. The year is the verified review date.
    slugs
    • physiological-sigh

  7. Sahil Bloom's physiological-sigh thread ↗

    id
    self25-physiological-sigh-x-presentations — Sahil Bloom's physiological-sigh thread
    platform
    X via Thread Reader App mirror
    role
    Community discussion
    accessed On
    2026-09-27
    published Or Updated
    2023-02-06
    locator
    Thread 1622600753054457856; first-person account about presentations and power poses; newsletter promotion
    scope
    One creator's report of benefit before presentations, with another practice used alongside it.
    limitations
    Mirror inspected, not direct X; original returned 403. The thread promotes a newsletter and contains exaggerated efficacy and carbon-dioxide claims that are not adopted. The personal account does not isolate the effect of sighing.
    slugs
    • physiological-sigh

  8. Does the psychological sigh work for you? ↗

    id
    self25-physiological-sigh-reddit-temporary — Does the psychological sigh work for you?
    platform
    Reddit / r/HubermanLab
    role
    Community discussion
    accessed On
    2026-09-27
    published Or Updated
    2023-11-07
    locator
    Opening post by LearningStudent221; replies by preetham_graj and Adaptation44
    scope
    Short-lived relief, noticing stressful thoughts and muscle tension, and preference for box breathing.
    limitations
    Self-selected anecdotes, no verified technique or lasting outcome. Title says psychological, but the discussion explicitly identifies the physiological sigh. Exact post date appears in indexed calendar metadata; the opened page uses relative timestamps.
    slugs
    • physiological-sigh

  9. physiological sigh — great for anxiety, both day- and night-time! ↗

    id
    self25-physiological-sigh-reddit-bedtime — physiological sigh — great for anxiety, both day- and night-time!
    platform
    Reddit / r/Menopause
    role
    Community discussion
    accessed On
    2026-09-27
    published Or Updated
    2024-01-17
    locator
    Opening post by VanWatcher; workday-bedtime reply by 4rt3m1sx; page calendar footer
    scope
    Reported use for a racing mind at bedtime, worry after a 4 a.m. awakening, and a workday bedtime habit.
    limitations
    First-person coping reports from a menopause community, not measured sleep improvement or evidence of treating menopause. Replies about other yoga breaths are not attributed to cyclic sighing.
    slugs
    • physiological-sigh

  10. Is the physiological sigh a forced exhale or relaxed? ↗

    id
    self25-physiological-sigh-reddit-exhale-effort — Is the physiological sigh a forced exhale or relaxed?
    platform
    Reddit / r/HubermanLab
    role
    Community discussion
    accessed On
    2026-09-27
    published Or Updated
    2026-09-25
    locator
    Opening post by WillOk6461 and relaxed/extended-exhale reply by ThisFuckingGuy_
    scope
    A reported heart-rate increase with forceful exhaling and a different person's preference for a relaxed, longer out-breath.
    limitations
    Unverified personal reports. A numeric exhale target and a video demonstration mentioned by other commenters are not adopted. Date is explicit in indexed metadata; the opened page shows relative timestamps.
    slugs
    • physiological-sigh

  11. Why does the physiological sigh not seem to help me anymore than diaphragmatic breathing does? ↗

    id
    self25-physiological-sigh-reddit-nonresponse — Why does the physiological sigh not seem to help me anymore than diaphragmatic breathing does?
    platform
    Reddit / r/HubermanLab
    role
    Community discussion
    accessed On
    2026-09-27
    published Or Updated
    2024-06-16
    locator
    Post title and replies by Iannelli and astride_unbridulled; page calendar footer
    scope
    No extra benefit over belly breathing, a report of no benefit from sighing, and preference for 4-7-8 breathing.
    limitations
    Personal comparisons without controlled conditions. Speculative anatomy explanations and attacks on a public figure in the thread are excluded.
    slugs
    • physiological-sigh

  12. Sahil Bloom thread, 6 February 2023 ↗

    id
    portfolio-self-sigh-x-mirror — Sahil Bloom thread, 6 February 2023
    role
    Community discussion
    accessed On
    2026-09-23
    locator
    search_text_inspected_mirror_opened
    scope
    The mirrored thread popularizes a few repeated double-inhale/long-exhale breaths for quick stress relief.
    limitations
    Indirect copy of an X thread. Its immediate or near-guaranteed relief claims are not adopted as established findings.

  13. Brief structured respiration practices enhance mood and reduce physiological arousal ↗

    id
    portfolio-self-sigh-study — Brief structured respiration practices enhance mood and reduce physiological arousal
    role
    Professional context
    accessed On
    2026-09-23
    locator
    abstract_text_inspected
    scope
    The randomized study tested five minutes daily for one month; this does not verify a universal 30-second stress cure.
    limitations
    Study context constrains claims; it does not replace community experience.

Keep this topic in view

Preserved original record

Earlier public profile and reader notes are preserved separately from the current article. They may contain superseded wording and are not newly checked material.

Read the full original profile
slug
physiological-sigh
name
Physiological sigh
aliases
  • double inhale
  • physiological sigh breath
  • huberman sigh
  • cyclic sighing
family
calm
heat
high
talk
Lots of talk
most Discussed
false
first Line
A physiological sigh is a breathing pattern with an inhale, a second smaller inhale and a longer exhale; cyclic sighing repeats that pattern.
why Line
The double inhale and longer exhale feels like a brief pause to some people. Repeated or forceful breathing can also feel uncomfortable or make someone lightheaded, and a viral quick-relief claim is not a guaranteed result.
feel Words
  • double inhale
  • physiological sigh breath
  • huberman sigh
  • cyclic sighing
common Picture
  • lead
    Study duration differs from a short clip
    why
    The cyclic-sighing trial tested five minutes a day for one month; that differs from the few breaths promoted in quick-relief clips. [professional]
  • lead
    Choose a comfortable setting
    why
    The accounts describe a brief pause before returning to the task, rather than prolonged or forceful breathing. [community]
watch For
Forceful breathing can cause dizziness. Repeated or worsening panic needs professional help; a short video cannot diagnose or treat its cause.
what People Say
  • The intended use: a brief breathing pause when someone feels keyed up. Some report quick relief, but “under a minute” is not a reliable outcome established by the cited month-long study. [community/trial]
  • 2023–26 clips made ‘physiological sigh’ a search term. [community]
  • Not a diagnosis and not a drug. [community]
how People Run It
  • Inhale, sip more air, long exhale. Repeat 1–5 times. [community]
amounts People Use
  • A few breaths. Not a 20-minute sit. [community]
how People Keep It
  • Use it when the chest is loud, not as a personality. [community]
how It Feels
  • Lightheaded if they overdo the top-up. [community]
how Long People Run It
  • Seconds. [community]
deep Dive
  • The breathing pattern: A physiological sigh involves a double inhale followed by a longer exhale. It uses a different sequence from box breathing. [community]
  • The clip and the study describe different amounts: A mirrored 2023 X thread popularizes a few repeated double-inhale, long-exhale breaths for quick relief. The randomized cyclic-sighing study tested five minutes a day for one month. Neither the mirror nor that study establishes that a few breaths will reliably end stress within 30 seconds. [community/professional]
  • What someone may notice: Reports include a brief pause and possible lightheadedness when people force the pattern. That is more useful than counting breaths as a challenge. Sighing and box breathing use different patterns; neither should be presented as a diagnosis or as an instruction to keep going through discomfort. [community]
watch For Long
  • Dizzy, chest pain, panic that does not pass: clinician. [community]
related
  • box-breathing
  • nsdr-down
  • ten-minute-sit
  • nervous-system
research Pointer
    play Pointer
    —
    forums
    • r/HubermanLab
    • r/meditation
    sources
    • 2023–26 physiological-sigh / cyclic-sighing clips
    • r/HubermanLab breath threads
    • physiological-sigh clip talk
    disclaimer
    Community talk. May contain inaccuracies. Not medical or health advice. No result or safety is promised.
    quick Answer History
    • field
      communityPicture
      rows
      • People copy a double nose inhale and a slow mouth exhale from 2023–26 clips, often at a desk. They compare it with box breathing and say a few rounds is the whole practice.
    • field
      definition
      rows
      • A physiological sigh is a breathing pattern of two inhales and one long exhale used as a short downshift.
    • field
      deepDive
      rows
      • A named breath, not a protocol: The double inhale plus long exhale is the object. Box breathing stays the neighbor card. [community]
    • field
      whatPeopleSay
      rows
      • The job: drop the chest noise in under a minute. [community]
    • field
      commonPicture
      rows
      • lead
        Two inhales, long exhale
        why
        Nose, top-up, mouth. [community]
      • lead
        A few rounds, not an hour
        why
        Clips sell it as fast. [community]
      • lead
        Neighbor to box breathing
        why
        Different pattern, same ‘downshift now’ job. [community]
    • field
      firstLine
      rows
      • A physiological sigh is two inhales through the nose and a long mouth exhale — a 30-second downshift people copy from 2023–26 clips.
    • field
      whyLine
      rows
      • A physiological sigh is two inhales through the nose and a long mouth exhale — a 30-second downshift people copy from 2023–26 clips.
    • field
      watchFor
      rows
      • Dizziness, panic that needs a clinician, or treating a clip as a diagnosis. Not a compound.
    Read the preserved reader notes
    picture Clarifications
      definition
      A physiological sigh is a breathing pattern with an inhale, a second smaller inhale and a longer exhale; cyclic sighing repeats that pattern.
      community Picture
      The double inhale and longer exhale feels like a brief pause to some people. Repeated or forceful breathing can also feel uncomfortable or make someone lightheaded, and a viral quick-relief claim is not a guaranteed result.
      additions
        guide
        what
        • A physiological sigh, in the way this card uses the phrase, is a short breathing pattern: a breath in, a second sip of air to top it off, then a long breath out. People use a few repeats as a downshift before a hard moment or after one. It is not a compound and not a diagnosis.
        • A 2023 Stanford trial in Cell Reports Medicine compared a few minutes a day of cyclic sighing with other brief breath practices and with mindfulness. Cyclic sighing was the double inhale and long exhale. One trial is a finding about that protocol, not a personal prescription and not proof that five breaths fix a crisis.
        • Dizziness means ease off and breathe normally. Panic that needs a clinician, or any emergency, is not a breathing clip.
        how
        • Sit or stand in a stable place. Inhale through the nose. Before exhaling, sip in a little more air. Then breathe out slowly through the mouth, longer than the inhale. That is one cycle.
        • Repeat a handful of times, in the range of one to five cycles for a moment of downshift. The Stanford protocol people cite was about five minutes a day, not a single heroic breath. Stop if the room spins.
        • Use it before a hard call, in the car before walking in, or in bed only after the caffeine problem is already handled. Do not practice it while driving in a way that takes attention off the road.
        • If breathing trouble, chest pain, or fainting is the reason for the breath, stop and get medical help. The pattern is a skill for an ordinary spike, not a treatment plan.
        understand
        • The long exhale is the part that slows the cycle. The second inhale is what makes this pattern different from a generic deep breath. People still call lots of unrelated exercises a sigh. The shape is two in, one long out.
        • The miss is treating a social-media clip as care for panic attacks, or pushing through dizziness because a rep count remains. Another miss is expecting one cycle to erase a short night.
        • Community notes describe when people use it. The trial describes a daily few minutes. Neither one is an emergency service. In the U.S., call or text 988 for a mental-health crisis, and call 911 for immediate danger.
        sources
        summary Sources
        note References
        Download original public profileDownload complete article

        End of Physiological sigh