Wind down. Drift off.
Set a timer, choose a soothing sound and let it fade away softly as you fall asleep. Plus a bedtime calculator and a calming breathing guide.
Space start or pause ยท D dim screen ยท + add 5 min
๐ง Sleep sounds
Sounds are generated live in your browser, so they work offline and never loop in a way you can hear. They fade in gently, too.
๐๏ธ Bedtime calculator
Sleep runs in cycles of about 90 minutes. Waking at the end of one feels easier. Adults need 7 or more hours.
Going to bed now? Wake at:
๐ฌ๏ธ 4-7-8 breathing
Breathe in for 4, hold for 7, breathe out slowly for 8. Four gentle rounds.
๐ Your timer log
Frequently asked questions
How does the sleep timer work?
Pick a length, choose a sound and press Start. The sound plays and then fades out gently over the last few minutes, so it does not stop suddenly and wake you.
Do the sounds need an internet connection?
No. Every sound is generated live in your browser, so once the page has loaded it works offline and never repeats in a loop you can hear.
Which sound is best for sleep: white, pink or brown noise?
It is personal. White noise is bright and masks sharp sounds, pink noise is softer, and brown noise is deep and rumbly. Many people find brown or pink noise more relaxing. Keep the volume low.
How does the bedtime calculator work?
Sleep runs in cycles of about 90 minutes. The calculator counts back whole cycles from your wake-up time, plus the time you usually take to fall asleep, so you wake at the end of a cycle instead of in the middle.
How much sleep do adults need?
The US CDC recommends 7 or more hours a night for adults aged 18 to 60, 7 to 9 hours for ages 61 to 64, and 7 to 8 hours from 65. Teenagers need 8 to 10 hours.
What is 4-7-8 breathing?
A simple relaxation exercise: breathe in through your nose for 4 seconds, hold for 7, then breathe out slowly through your mouth for 8. The guide on this page leads you through four rounds.
Will my phone screen stay on?
While the timer runs, the page asks your browser to keep the screen awake so the sound keeps playing. Use Dim screen to turn the page almost black. Keep the tab open until the timer ends.