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Sleep · 4 min read

4-7-8 breathing: how to do it, and what it actually does

Breathe in for 4, hold for 7, breathe out for 8: 4-7-8 breathing is one of the best-known exercises for winding down. Here’s how to do it, what’s actually known about it, and what to do when the hold feels too long or makes you lightheaded.

By Published

Key takeaways

  • How to do it: breathe all the way out once, then in through your nose for 4 seconds, hold for 7, and out through your mouth with a whoosh for 8. Four rounds are plenty to start.
  • If the hold feels too long, count faster. 3-5-6 has almost the same shape and is easier.
  • The research is thin: studies mostly measure short-term effects on heart rate and heart rate variability in healthy people. In a head-to-head comparison, six slow breaths a minute changed heart rate variability more.
  • Only hold as long as it feels easy. Never in or near water, never while driving, and if you get dizzy, just breathe normally.

How to do 4-7-8 breathing

This is how one study with young adults taught it:1

  1. Lie down or sit comfortably and close your eyes.
  2. Breathe out completely through your mouth, with an audible whoosh.
  3. Close your lips and breathe in quietly through your nose while you count to 4.
  4. Hold your breath while you count to 7.
  5. Breathe out through your mouth with a whoosh while you count to 8.

That’s one round. Four are plenty to start with, then just breathe normally.

Four rounds of 4-7-8

Breathe all the way out first

4 seconds in, 7 hold, 8 out. Never hold until you’re gasping; if it gets tight, count faster.

The ratio matters more than the seconds

Seven seconds of holding feels long to a lot of people at first. Counting faster helps, and the shape stays almost the same: the exhale is twice as long as the inhale, with the hold in between.

Three bars with the phases breathe in, hold and breathe out: 4-7-8 takes 19 seconds, 3-5-6 takes 14 seconds, 2-3.5-4 takes 9.5 seconds. All three have almost the same shape. 4-7-8 19 s 3-5-6 14 s 2-3.5-4 9.5 s in hold out
  1. 4-7-8: 19 seconds per round, 15 of them for holding and breathing out.
  2. 3-5-6: the same sequence, just counted faster.
  3. 2-3.5-4: half the length of the original, same shape.
Bar length matches the seconds. What matters is the shape: short in, longer hold, longest out.

A lab study with 30 adults suggests why a long exhale helps you relax: people felt more relaxed when they breathed out longer than they breathed in, whether they breathed fast or slow.2 That study didn’t include any breath hold at all.

Where 4-7-8 comes from

4-7-8 breathing goes back to Andrew Weil, who adapted it from a yoga breathing technique. It’s meant to help you wind down and fall asleep.1 You’ll often read that it puts you to sleep “in 60 seconds.” I couldn’t find a study that measured that.

What the research shows

So far, studies have mostly measured what happens in the body right after the exercise:

  • Heart rate and heart rate variability: 43 healthy young adults did three sets of six rounds, with a minute of normal breathing in between. Afterward, heart rate was lower in both groups. In the well-rested group, a heart rate variability measure linked to the calming branch of the nervous system went up; in the sleep-deprived group, other measures went down.1
  • Head to head: in 84 college students, six breaths a minute raised heart rate variability more than 4-7-8 or box breathing did. None of the exercises had a meaningful effect on blood pressure or mood in the lab. The researchers note themselves that 4-7-8 and box breathing are widely recommended but have little research behind them.3

Both studies tested the technique, not the nowa app. Other studies mostly involve patients, for example after surgery. They say little about what the exercise does for healthy people, so I don’t count them here.

4-7-8 is a pleasant structure for your evening, not a proven sleep hack. If you’d rather skip the hold, slow breathing with a long exhale works too; in the lab comparison it even changed heart rate variability more.

When the hold feels hard or makes you dizzy

  • The hold feels endless: count faster or switch to 3-5-6. Never hold until you’re gasping.
  • You feel dizzy or notice tingling in your hands or lips: you’re probably breathing too much. Breathe in more gently, do fewer rounds, or just breathe normally for a while.
  • You feel more restless, not less: that happens, and it’s not a failure. Drop the hold and breathe slowly with a long exhale, for example as in breathing exercises for sleep.
  • Counting keeps you awake: let a pacer or a vibration do the counting for you.

Only hold your breath as long as it feels easy, never until you’re gasping for air. Never practice breath holds in or near water (including the bathtub), while diving or driving, or anywhere a brief blackout could be dangerous. Don’t breathe fast and deep beforehand: a CDC report describes 16 underwater breath-holding incidents, and all four people who died had deliberately hyperventilated first.4 If you’re pregnant or have a heart or circulation condition, high blood pressure, epilepsy, glaucoma, or panic disorder, skip longer breath holds or check with your doctor first.

How often, and when?

There are no fixed rules from research. In the study with 43 young adults, people did three sets of six rounds.1 In everyday life, four rounds are enough, in bed at night or in a quiet moment during the day. Feeling comfortable matters more than the count.

Frequently asked questions

Is 4-7-8 breathing dangerous?
Sitting or lying down, and without straining during the hold, it’s fine for most people. Holding your breath gets dangerous in water and behind the wheel. If you have a medical condition or are pregnant, check with your doctor first.
Nose or mouth?
In through your nose, out through your mouth with a whoosh, as in the study.1 If you’d rather breathe out through your nose, that’s fine too.
How many rounds in a row?
Four to start. If it feels good, you can do more; if you get dizzy, stop.
4-7-8 or box breathing?
In box breathing all four phases are the same length, with two pauses; in 4-7-8 the exhale is longest. In nowa, box breathing sits under Focus and 4-7-8 under Sleep. Neither has much research behind it; more in the article on box breathing.
Will it put me to sleep in 60 seconds?
No study promises that. Give yourself ten to fifteen minutes, without pressure.

This article shares general information about breathing exercises for relaxation and well-being. It is not medical advice and does not replace diagnosis or treatment by a licensed professional. nowa is a wellness app. It is not a medical device and is not intended to diagnose, treat, cure, or prevent any disease. Only practice while it feels comfortable. If you feel dizzy or short of breath, or notice a racing heart, chest pain, or strong anxiety, stop and breathe normally. If you have a medical condition (for example a heart or lung condition, or epilepsy) or are pregnant, talk to your doctor or midwife before trying new breathing exercises. Never change prescribed treatment on your own.

Sources

  1. Vierra J, Boonla O, Prasertsri P (2022). Effects of sleep deprivation and 4-7-8 breathing control on heart rate variability, blood pressure, blood glucose, and endothelial function in healthy young adults. Physiological Reports 10(13):e15389. doi.org/10.14814/phy2.15389
    Lab study, 43 healthy young adults, single session
  2. Van Diest I, Verstappen K, Aubert AE, Widjaja D, Vansteenwegen D, Vlemincx E (2014). Inhalation/exhalation ratio modulates the effect of slow breathing on heart rate variability and relaxation. Applied Psychophysiology and Biofeedback 39(3–4):171–180. doi.org/10.1007/s10484-014-9253-x
    Lab study, 30 adults
  3. Marchant J, Khazan I, Cressman M, Steffen P (2025). Comparing the effects of square, 4-7-8, and 6 breaths-per-minute breathing conditions on heart rate variability, CO2 levels, and mood. Applied Psychophysiology and Biofeedback 50(2):261–276. doi.org/10.1007/s10484-025-09688-z
    Lab comparison, 84 college students
  4. Boyd C, Levy A, McProud T, Huang L, Raneses E, Olson C (2015). Fatal and nonfatal drowning outcomes related to dangerous underwater breath-holding behaviors: New York State, 1988–2011. Morbidity and Mortality Weekly Report 64(19):518–521. ncbi.nlm.nih.gov/pmc/articles/PMC4584570
    CDC case report, 16 cases

All sources last checked on October 28, 2026. Spotted a mistake? Write to support@nowabreathing.com and I’ll fix it and note the change here.