Sleep time
When should I go to bed?
Tell us when you need to wake up and see when to go to bed. Sleep is counted in 90-minute cycles.
What is a sleep cycle?
During sleep the body moves through light sleep, deep sleep and dream sleep again and again. One round lasts about 90 minutes on average, though it can be 70 to 120 minutes from person to person. So this is a rough guide.
Adults are generally said to need around 7 to 9 hours of sleep. Notice how much leaves you refreshed and go by that.
This is general information, not medical advice. If you have long-lasting trouble sleeping, talk to a doctor.
About this tool
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What you get
When to go to bed if you must wake at a set time, and when to wake if you sleep now.
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How it works
Sleep is counted in cycles of about 90 minutes, plus the time it takes you to fall asleep.
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Keep in mind
- A cycle is an average and can be 70 to 120 minutes.
- Adults usually need 7 to 9 hours.
- See a doctor if sleep trouble lasts.