Free sleep tool
Breathing Pacer
A visual guide for 4-7-8, box, and coherent breathing — follow the circle, slow your breath, wind down for bed.
A long hold and a long exhale. The most demanding of the three — start here only if breath-holding feels comfortable.
Press start when you're ready.
What this does and doesn't do
Breathing slowly, at around six breaths a minute, has measurable effects: heart-rate variability rises, EEG alpha power increases, and people report feeling calmer. That much is well documented. What is not established is that any particular count beats any other. The most tightly controlled trial we could find compared coherent breathing against a well-designed breathwork placebo and found no advantage for the real pattern — everyone improved, nobody improved more.
4-7-8 in particular is sold with far more certainty than its evidence supports; it has almost no direct sleep research behind it. Its long exhale and slow overall rate are sensible, which is why it is here, but pick whichever of the three you will actually keep doing. That appears to matter more than the numbers.
If holding your breath makes you dizzy or uncomfortable, stop. Coherent breathing has no holds at all and is the gentler place to start.
Questions
- Which breathing technique should I choose for sleep?
- None of the three patterns here has evidence of being the best one. In the most tightly controlled trial cited on this page, coherent breathing went up against a carefully designed breathwork placebo, and both groups improved about the same amount. Given that result, choose whichever pattern you can imagine repeating on ordinary nights; sticking with one seems to count for more than its exact numbers.
- How long should I do a breathing exercise before bed?
- The pacer runs four rounds, eight rounds, or until you press stop, and starts at eight. Eight rounds of 4-7-8 comes to about two and a half minutes, enough time to settle without turning into a chore. None of the research on this page identifies an ideal duration, so treat the round count as a comfort setting and stop whenever you have had enough.
- Does 4-7-8 breathing help you fall asleep?
- Direct sleep research on 4-7-8 barely exists, despite how confidently it gets promoted. What the evidence does support is slow breathing in general: at around six breaths a minute, heart-rate variability rises, EEG alpha power increases, and people report feeling calmer. The long exhale and slow overall pace of 4-7-8 fit inside that picture, and they earned it a place here. Expect a calmer few minutes; nothing demonstrated so far makes it an off-switch.
- What is the difference between box breathing and coherent breathing?
- Box breathing is four equal counts of four seconds: inhale, hold, exhale, hold, a shape that is easy to remember and keep steady. Coherent breathing drops the holds: five seconds in, five seconds out, around six breaths a minute, well inside the range the slow-breathing research covers. Anyone who feels dizzy or uncomfortable holding their breath should stop and take up coherent breathing, the gentlest of the three.
- Can I do these breathing exercises lying in bed?
- Each pattern is a count short enough to carry to bed with you. 4-7-8 is breathe in for four, hold for seven, out for eight; box is fours all the way around; coherent is five in, five out. A few rounds with the pacer on screen teach the rhythm, and after that counting silently in the dark works the same way.
Where these numbers come from
- Slow-breathing physiology: Zaccaro et al. 2018, a systematic review of breathing at under about ten breaths a minute.
- No advantage over a matched placebo: Fincham et al. 2023, a randomized trial of coherent breathing against a breathwork placebo.
- One pattern that did beat a real comparator (cyclic sighing, over meditation, on mood): Balban et al. 2023.
This is general information, not medical advice. Sleep that stays bad for weeks is worth taking to a doctor.
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