4-7-8 breathing: the guided exercise

4-7-8 breathing takes four rounds: breathe in through your nose for 4 seconds, hold your breath for 7 seconds, then breathe out slowly through your mouth for 8 seconds. It was popularized by the American physician Andrew Weil. The animated guide below counts for you, and further down we tell you honestly what the few studies on it have found.

Guided exercise

In for 4 s · hold for 7 s · out for 8 s

StartStopClose Restart

Length: 4 roundsLength: 8 rounds

4 rounds take 1 min 16 s. If you feel lightheaded, stop and breathe normally.

How to do 4-7-8 breathing

These are the steps as Andrew Weil describes them on his website. The guide above follows the same rhythm.

Sit up straight. That’s the recommended position while you learn. Once you know it, you can do it in any position, including lying down.
Place your tongue. Rest the tip of your tongue against the ridge of tissue just behind your upper front teeth, and keep it there for the whole exercise.
Empty your lungs. Breathe out completely through your mouth, around your tongue, making a soft whoosh sound.
Breathe in through your nose for a count of 4. Mouth closed, quietly.
Hold your breath for a count of 7. Without clenching your throat or shoulders.
Breathe out through your mouth for a count of 8. With the same whoosh, all the way out.
Repeat three more times. Four rounds in total, then go back to breathing normally.

The exact timing matters less than the proportions: according to Weil, it’s the 4-7-8 ratio that counts. If holding for 7 seconds is hard, count faster and keep the same proportions. With practice, you can slow it down.

Where does 4-7-8 breathing come from?

Andrew Weil is an American physician and the founder of the integrative medicine center that bears his name at the University of Arizona. He presents 4-7-8, which he also calls the “relaxing breath,” on a page of his website devoted to three breathing exercises. Cleveland Clinic notes that the technique has ancient roots in pranayama, the yogic practice of focusing on the breath.

Weil calls it “a natural tranquilizer for the nervous system” that gains in power with practice. That’s a practitioner’s view, not a study finding: as far as we know, no trial has tested that claim.

Pattern: 4 seconds in, 7 seconds hold, 8 seconds out
One round: 19 seconds, or about 3 breaths a minute
Session: 4 rounds (1 min 16 s); no more than that for the first month, says Weil, then up to 8
How often: At least twice a day, Weil suggests

What the research says about 4-7-8 breathing

4-7-8 breathing is shared everywhere online but has barely been studied. Here are the studies we found, and what they actually measured.

One session in young adults (Vierra and colleagues, 2022). Forty-three people aged 19 to 25, some of them sleep-deprived, did three sets of six rounds. Right afterward, their heart rate and systolic blood pressure had dropped. The heart rate variability results were mixed: a measure linked to the vagus nerve rose in those who had slept well, while other measures fell in the sleep-deprived group. There was no comparison group breathing normally.
After weight-loss surgery (Aktaş and İlgin, 2023). In this randomized trial of 90 patients, the group practicing 4-7-8 breathing ended up with lower anxiety than both a deep-breathing group and a usual-care group. It’s a very specific hospital setting.
A head-to-head comparison (Marchant and colleagues, 2025). Eighty-four college students tried box breathing, 4-7-8 breathing and breathing at 6 breaths a minute. 4-7-8 breathing raised heart rate variability less than 6 breaths a minute did, and none of the patterns tested meaningfully changed mood or blood pressure after one session. The authors note that box and 4-7-8 breathing are popular but have “little empirical support.”

In short: 4-7-8 is very slow breathing with an exhale twice as long as the inhale, and slow breathing in general has measurable effects on the heart (see our page on coherent breathing). But the evidence specific to 4-7-8 is thin, and we found no controlled study of its effect on falling asleep.

How many times a day should you do 4-7-8 breathing?

Andrew Weil recommends at least twice a day, sticking to four rounds at a time for the first month, then up to eight if you like. Cleveland Clinic, for its part, suggests three rounds twice a day. That’s why the guide on this page offers 4 or 8 rounds. Beyond that, no “ideal dose” has been shown: a short session you repeat beats a long one you force.

4-7-8 breathing for sleep

Weil also recommends 4-7-8 breathing to help you fall asleep. No study has checked that yet, but there’s no harm in trying: do your four rounds once you’re in bed with the lights off, then let your breathing settle on its own. If the 7-second hold keeps you alert or tense, try our breathing exercise for sleep instead, with no hold and simply a longer exhale.

Is 4-7-8 breathing safe?

Feeling lightheaded. Both Weil and Cleveland Clinic say mild lightheadedness can happen at first. If it does, stop, breathe normally, and try again later with a faster count.
Don’t force the hold. Holding your breath shouldn’t become a test. If it’s uncomfortable, shorten every count and keep the proportions.
Never in water. Holding your breath or hyperventilating before going underwater can make you black out. A New York State review published by the CDC described 16 such incidents, some of them fatal.
Ask your doctor first if you’re pregnant or have a heart or lung condition, glaucoma or epilepsy: a recent breathing study (Balban and colleagues, 2023) excluded these conditions as a precaution.

Selfia is not a medical device. If you’re struggling or thinking about suicide, help is available: in the US, call or text 988; in the UK and Ireland, call Samaritans on 116 123; anywhere else, find a local line at findahelpline.com.

Frequently asked questions

How many rounds of 4-7-8 breathing should I do?

Four rounds per session, which takes 1 minute 16 seconds. That’s Andrew Weil’s instruction for your first month of practice; after that, he says you can go up to eight rounds. He suggests at least two sessions a day. These guidelines come from his practice, not from studies comparing different lengths.

Does 4-7-8 breathing really help you sleep?

It’s often promoted that way, but no controlled study has measured its effect on falling asleep yet. Slow breathing before bed has been studied in good sleepers, with a small improvement in how well they felt they slept. If 4-7-8 relaxes you, keep it; if the breath hold winds you up, choose slow breathing without a hold.

Is 4-7-8 breathing dangerous?

For a healthy person, four rounds on dry land carry few known risks. The most common side effect is feeling lightheaded at first. Stop if you feel dizzy, never do it in water, and check with your doctor if you’re pregnant or have a heart or lung condition.

Why put your tongue behind your teeth?

It’s one of Andrew Weil’s instructions: keep the tip of your tongue on the ridge behind your upper front teeth for the whole exercise. No study has looked at what it does. If it feels awkward at first, focus on the rhythm, then add the tongue position once the count feels natural.

How is it different from coherent breathing?

Coherent breathing has no breath hold and runs at about 6 breaths a minute for 5 minutes. 4-7-8 adds a hold and slows down to about 3 breaths a minute, in a very short session. In the only study that compared them directly, breathing at 6 a minute raised heart rate variability more.