What time should I go to bed to wake up at 4:00 PM?
To wake up at 4:00 PM at the end of a full sleep cycle, the best bedtimes are 6:45 AM (6 cycles) or 8:15 AM (5 cycles), allowing about 15 minutes to fall asleep.
Best bedtimes for a 4:00 PM alarm
| Bedtime | Cycles | Total sleep |
|---|---|---|
| 6:45 AM — best | 6 | 9 hours |
| 8:15 AM | 5 | 7.5 hours |
| 9:45 AM | 4 | 6 hours |
Each bedtime lines your 4:00 PM alarm up with the end of a 90-minute sleep cycle, so you wake during lighter sleep rather than deep sleep. For most adults the 6-cycle bedtime of 6:45 AM gives a full, refreshed morning; 8:15 AM (5 cycles, 7.5 hours) is the practical sweet spot on a normal work night.
How the 4:00 PM bedtimes are worked out
The calculator counts backward from your 4:00 PM alarm in 90-minute steps and adds about 15 minutes to fall asleep. Six cycles back lands you at 6:45 AM, five cycles at 8:15 AM, and four cycles at 9:45 AM for a shorter 6-hour night. Waking at the end of a cycle — when sleep is lightest — is what makes 4:00 PM feel easy instead of groggy.
Is 4:00 PM a good time to wake up?
A 4:00 PM wake-up suits most work and school routines. What makes it feel good is repetition: hold the same rising time daily and protect a bedtime close to 6:45 AM, and within a couple of weeks your internal clock does most of the waking for you, leaving the 4:00 PM alarm as a safety net.