Set an alarm for 4:00 AM
⏰ The alarm will ring at 4:00 AM — in 9 h 15 min
Set an alarm for another time
Best bedtimes to wake up at 4:00 AM
| Go to bed at | Sleep cycles | Sleep |
|---|---|---|
| 6:45 PM | 6 | 9 h |
| 8:15 PM | 5 | 7 h 30 min |
| 9:45 PM | 4 | 6 h |
| 11:15 PM | 3 | 4 h 30 min |
Assumes about 15 minutes to fall asleep and sleep cycles of roughly 90 minutes. Cycle length varies from person to person, so treat these as estimates.
Snooze times after a 4:00 AM alarm
| Snooze length | 1st | 2nd | 3rd |
|---|---|---|---|
| 5 minutes | 4:05 AM | 4:10 AM | 4:15 AM |
| 9 minutes | 4:09 AM | 4:18 AM | 4:27 AM |
| 10 minutes | 4:10 AM | 4:20 AM | 4:30 AM |
Nine minutes is the traditional snooze length on many alarm clocks.
About 4:00 AM
At 4 AM early-morning workers begin to stir; delivery drivers, farmers and airport staff often start their day during this hour.
Press “Start Alarm” and keep this tab open; press “Test Alarm” first to check the volume.
About 4:00 AM
| 12-hour clock | 4:00 AM |
|---|---|
| 24-hour clock | 04:00 |
| Military time | 0400 |
| In words | Four o'clock |
| Part of the day | Night |
Questions about a 4:00 AM alarm
How do I set an alarm for 4:00 AM?
Open this page, press “Start Alarm” and leave the tab open. The alarm rings at 4:00 AM, which is 9 hours, 15 minutes from now.
What time should I go to bed to wake up at 4:00 AM?
For five full sleep cycles, go to bed around 8:15 PM; for six cycles, around 6:45 PM.