4-7-8 breathing: how to do it and what the research says
4-7-8 breathing means breathing in through your nose for a count of four, holding for seven, and breathing out through your mouth for eight. You repeat it four times. What makes it useful at bedtime is the ratio: the exhale is twice as long as the inhale, and a long exhale is the most direct way you have to slow your body down. Research on 4-7-8 itself is thin, but the research on slow breathing in general is solid.
How do you do 4-7-8 breathing?
- Sit or lie down in whatever position feels comfortable. Rest the tip of your tongue just behind your upper front teeth and keep it there throughout.
- Breathe all the way out through your mouth, with a soft whoosh.
- Close your mouth and inhale through your nose for a count of four.
- Hold your breath for a count of seven.
- Exhale through your mouth for a count of eight, slowly, until your lungs are empty.
- That is one cycle. Do four.
The numbers are not clock seconds: they are a ratio. If counting to seven with a full chest makes you uncomfortable, count faster. What matters is that the hold is longer than the inhale, and the exhale is the longest of the three.
Where does it come from?
The technique comes from the breath-control practices of yoga (pranayama) and was popularized by the American physician Andrew Weil, who recommends it for falling asleep and for tense moments. Its popularity has run well ahead of the research: it is one of the most searched-for breathing techniques and one of the least measured.
What does the research say about 4-7-8 breathing?
Not much, and it is worth saying so plainly. The most cited study measured 43 healthy young adults, half of them after a night without sleep. Each person did three sets of six 4-7-8 cycles, with a minute of normal breathing between sets.
In both groups, heart rate and systolic blood pressure dropped right after the exercise. In the group that had slept, the component of heart rate variability linked to the nervous system's "brake" also rose. In the sleep-deprived group, it did not.
It was a single session with no comparison group breathing a different way, so it cannot tell you that 4-7-8 beats any other slow breathing. What it does show is that, in the moment, the body responds.
Why does slow breathing work?
Here the evidence is broader. A systematic review of studies on slow breathing — fewer than ten breaths a minute — in healthy people found a consistent pattern: higher heart rate variability, changes in brain activity associated with relaxation, and, in what participants reported, more calm and less anxiety.
Four well-paced cycles of 4-7-8 bring you down to roughly three breaths a minute. In other words, 4-7-8 is an easy-to-remember way of doing something that is well studied.
Does 4-7-8 breathing help you fall asleep?
It can help you get to the point where sleep is possible, which is not quite the same thing. Do it in bed with the lights off. If you are still awake afterwards, that is fine: let your breathing return to its own pace and stay with the weight of your body on the mattress.
According to Meditar, the most common mistake is treating it like a switch — doing four cycles, checking whether you are asleep yet, and getting frustrated. It works better as a doorway than as a button.
How many times should you do it?
Four cycles to start. The long hold makes some people lightheaded the first few times, and starting small keeps you from associating the exercise with that feeling. Once it feels easy, you can work up to eight.
What if I feel dizzy?
It is the most common complaint and it almost always has the same cause: breathing in too hard. If you feel dizzy, stop and breathe normally until it passes. Next time, make the four-count inhale gentler, not a full gulp of air, and shorten the hold.
If you have a heart or respiratory condition, check with your doctor before trying any exercise that involves holding your breath.
A breath without the hold
If the hold does not sit well with you, cyclic sighing has none: two short inhales and one long exhale. It was the technique with the best results in the trial that compared several breathing practices over a month.
Breathe with a voice that keeps count
Counting in your head keeps awake exactly the part of you that you are trying to switch off. That is why these breathing exercises work better guided. Meditar is a guided meditation app where you pick the voice that guides you: you listen before choosing and keep the one that feels right. It has sleep and breathing meditations from five minutes, and it is free to start: download it here.