Set Alarm for 4 AM (4:00 AM)
The alarm below is already set to 4:00 AM. Press Set Alarm to arm it, and keep this tab open so it can ring.
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About this alarm
Early shifts, airport runs and pre-dawn flights start here. Lay out clothes and keys the night before, and keep your laptop plugged in so it doesn't go to sleep and stop the alarm.
An early start, before most of the day begins. This is the slot people use for flights, gym sessions and quiet work before anyone else is up, and it is the one where a backup alarm on your phone is genuinely worth setting too.
Need a different time? Change the hour, minute or AM/PM above - you can set any minute of the day, and this page stays put. The online alarm clock works exactly the same way.
What time to go to bed for a 4 AM alarm
| Go to bed at | Sleep | 90-min units (approx.) |
|---|---|---|
| 6:45 PM | 9 hours | 6 |
| 8:15 PM | 7 hours 30 minutes | 5 |
| 9:45 PM | 6 hours | 4 |
Each bedtime is worked backward from the alarm time: 15 minutes to fall asleep, then whole 90-minute blocks. Actual sleep cycles and how much sleep you need vary from person to person, and waking up every 90 minutes doesn't guarantee an easier wake-up - treat these times as a starting point, not a guarantee.
4:00 AM in other formats
- 24-hour clock: 4:00 AM = 04:00
- Spoken: four o'clock in the morning
- Bed at 10:00 PM: 6 hours until the alarm
- Bed at 11:00 PM: 5 hours until the alarm
- Bed at midnight: 4 hours until the alarm
Nearby alarm times
Questions about how it works? See the FAQ