Set Alarm for 4:30 AM

The form is pre-filled for 4:30 AM — hit Set Alarm to start the live countdown. Pick a sound, add a label, and the alarm will ring at 4:30 AM local time.

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No alarm set

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Set an alarm to start

How long until 4:30 AM?

4:30 AM is 04:30 in 24-hour time (0430 in military notation) — the middle of the night. The alarm counts down to the next 4:30 AM in your local time zone, rolling over to tomorrow if it has already passed today.

When to go to bed for a 4:30 AM alarm

Sleep runs in cycles of roughly 90 minutes, and waking at the end of a cycle usually feels easier than being pulled out of deep sleep halfway through one. Allowing about 15 minutes to fall asleep, these bedtimes line up with a 4:30 AM wake-up:

7:15 PM 6 cycles · 9 h of sleep

8:45 PM 5 cycles · 7 h 30 min of sleep

10:15 PM 4 cycles · 6 h of sleep

11:45 PM 3 cycles · 4 h 30 min of sleep

Adults generally need 7–9 hours, so five or six cycles (highlighted) suit most people. Treat these as a starting point — cycle length varies from person to person and through the night.

Hours of sleep by bedtime

In bed at	Sleep before 4:30 AM	Sleep cycles
6:30 PM	9 h 45 min	6.5
7:00 PM	9 h 15 min	6.2
7:30 PM	8 h 45 min	5.8
8:00 PM	8 h 15 min	5.5
8:30 PM	7 h 45 min	5.2
9:00 PM	7 h 15 min	4.8
9:30 PM	6 h 45 min	4.5
10:00 PM	6 h 15 min	4.2
10:30 PM	5 h 45 min	3.8
11:00 PM	5 h 15 min	3.5
11:30 PM	4 h 45 min	3.2

Highlighted rows give the 7–9 hours recommended for adults; ✓ marks a whole number of 90-minute cycles.

Nearby alarm times

4:00 AM Set alarm → 4:10 AM Set alarm → 4:20 AM Set alarm → 4:40 AM Set alarm → 4:50 AM Set alarm → 5:00 AM Set alarm →

Keep this tab open and your device awake for the alarm to ring — how browser alarms work. Need a duration instead of a clock time? Use the timer, or a 20-minute power-nap timer.