When should I wake up if I go to bed at 11 PM?

Allowing 15 minutes to fall asleep gives 6:15 AM for seven hours, 7:15 AM for eight hours and 8:15 AM for nine hours, all the next day. Time awake during the night is not included.

Does a sleep calculator guarantee that I will wake up refreshed?

No. These are duration estimates, not sleep-stage predictions. Sleep quality, health, interruptions and individual sleep needs all affect how you feel. The calculator does not use fixed 90-minute cycles.

Does Sleep now set an alarm?

No. Sleep now uses the current local time as bedtime to calculate suggestions. It does not set an alarm, schedule notifications or update the chosen time continuously.

Are daylight-saving changes included?

No. The calculation uses clock times without a calendar date or time zone. On nights when clocks change, the actual elapsed sleep duration can differ from the displayed duration.

Are my sleep times saved or uploaded?

Sleep inputs are calculated in your browser and remain only in the current page memory. This tool does not save them to an account, upload them or put them in the URL. Normal site navigation and visitor analytics still apply.

HEALTH TOOL

Sleep Calculator

Calculate bedtimes or wake-up times for 7, 8 or 9 hours of sleep. Allow time to fall asleep and compare adult sleep schedules with this free calculator.

Sleep planner

Go to bed at 11:00 PM

Charts use 8 hours

Go to bed at Wake up at

Bedtime

Time to fall asleep (minutes)

Recommended wake-up times

7-9 hours

7 hours
6:15 AM
The short end of the range · Next day
7h 15m in bed
8 hours
7:15 AM
The middle of the range · Next day
8h 15m in bed
9 hours
8:15 AM
The long end of the range · Next day
9h 15m in bed

Overnight timeline

15 min to fall asleep

Bedtime: 11:00 PM
Asleep by: 11:15 PM
Wake up: 7:15 AM

8h 15m in bed for 8 hours of sleep. Time in bed is not time asleep.

Duration comparison

7 / 8 / 9 hours

7 hours11:00 PM → 6:15 AM
8 hours11:00 PM → 7:15 AM
9 hours11:00 PM → 8:15 AM

Falling asleep Asleep

Weekly consistency

Educational guidance

Mon
11:00 PM
7:15 AM
Tue
11:00 PM
7:15 AM
Wed
11:00 PM
7:15 AM
Thu
11:00 PM
7:15 AM
Fri
11:00 PM
7:15 AM
Sat
11:00 PM
7:15 AM
Sun
11:00 PM
7:15 AM

Every night here is the same, which is the illustration. The CDC's healthy-sleep guidance is to keep bedtime and wake-up time reasonably consistent from day to day. These are the times above, repeated — not a prediction about any particular week.

Not medical advice

Adult planning estimates, not medical advice. Sleep needs vary; time in bed is not necessarily time asleep. These clock times do not account for overnight awakenings or daylight-saving changes.

How much sleep do adults need?

The US National Heart, Lung, and Blood Institute recommends 7 to 9 hours of sleep a night for adults. This is a general range, not a prescription for every person. Age, health, recovery from lost sleep and individual needs can change how much rest is appropriate.

Seven, eight and nine hours are planning options here. Eight hours is not automatically the best choice, and the shortest option should not become a target for cutting back on sleep. This calculator is intended for adults, not babies, children or teenagers.

Bedtime and wake-up time calculations

A wake-up time is bedtime plus the time spent falling asleep plus the planned sleep duration. For a target wake-up time, reverse the calculation: subtract the sleep duration and then subtract the time spent falling asleep.

For example, going to bed at 11:00 PM and allowing 15 minutes to fall asleep gives wake-up times of 6:15 AM, 7:15 AM and 8:15 AM the next day for 7, 8 and 9 hours of sleep. To wake at 7:00 AM with the same allowance, the corresponding bedtimes are 11:45 PM, 10:45 PM and 9:45 PM the previous day.

The day label is relative to the time you entered. Daytime sleep can start and end on the same day. These are local clock-time estimates without a calendar date, so a clock change or a change of time zone needs a separate adjustment.

Time in bed is not the same as time asleep

Sleep latency is the time between trying to sleep and actually falling asleep. A plan for eight hours of sleep with a 15-minute allowance needs eight hours and 15 minutes in bed, before allowing for any awakenings.

The starting allowance of 15 minutes is an editable assumption, not a measurement of your sleep or a clinical standard. The calculator does not measure sleep stages, predict a REM boundary or assume that every sleep cycle lasts exactly 90 minutes.

A consistent schedule and sleep quality matter too

The CDC notes that healthy sleep involves quality as well as enough hours. A schedule alone cannot tell whether sleep is refreshing or repeatedly interrupted.

Regular trouble falling asleep, repeated awakenings or continuing daytime sleepiness are reasons to speak with a healthcare professional. A calculator is not a diagnosis and cannot replace an individual care plan.

Keep bedtime and wake-up time reasonably consistent from day to day.
Keep the bedroom quiet, relaxing and comfortably cool.
Avoid caffeine late in the day and large meals or alcohol near bedtime.