Sound for sleep.
Fall asleep, stay asleep.
Plain answers on using sound for sleep: which beat to choose, whether pink noise or rain helps, what delta waves do, how long to nap and how to sleep before an exam. Each article says what the research shows and where it is thin.
Best frequency for sleep: which Hz actually helps The best frequency for sleep, by the research, is a 2 to 4 Hz delta binaural beat. 432 Hz and 528 Hz are tones with little sleep research. Binaural beats for sleep: which frequency, how long, and when to start For sleep, most people use a 2 to 4 Hz delta beat for 30 to 45 minutes, started as they get into bed, through headphones, at low volume. Delta waves and sleep: what they do and whether sound can bring them on Delta waves are slow brain waves of 0.5 to 4 Hz that fill deep sleep. They come mostly in the first half of the night and help store memories. Power nap length: how long to nap, and how to wake up fresh instead of groggy The ideal power nap length is 10 to 20 minutes of sleep. In a sleep-lab study, a 10 minute nap lifted alertness straight away, with no grogginess after. Pink noise for sleep: what the studies really show and how loud to play it Pink noise for sleep is not proven. A 2026 study of 25 adults found pink noise at 40 or 50 dBA cut REM sleep. If you use it, keep it low and let it fade. Rain sounds for sleep: why they help and how to use them all night Rain sounds for sleep work by covering sudden noises with a steady, natural sound. Keep them well below conversation level, about 60 dB, and use a fade out. How to stop racing thoughts at night: 6 things that help you fall asleep To stop racing thoughts at night, write a 5 minute to-do list, slow your breathing, give your mind a steady sound and get up after about 20 minutes awake. How much sleep before an exam? Hours, all-nighters and falling asleep when nervous Aim for 7 to 9 hours of sleep before an exam, or 8 to 10 if you are a teenager. Sleep across the week before matters even more than the last night.