Set Alarm for 4:00 AM
A free online alarm clock preset to 4:00 AM. Press Start, leave this tab open, and it will ring at 4:00 AM sharp.
Keep this tab open. For alarms that work with your phone locked, get AVA.
Waking up at 4:00 AM
An alarm set for 4:00 AM puts you awake before almost everyone else. The house is silent, the phone is not buzzing yet, and the first hour of the day belongs entirely to you — which is exactly why early risers guard this slot for workouts, deep work, or getting ahead of a demanding shift.
The hard part of a 4:00 AM alarm is not the waking — it is the bedtime it demands. To get five full 90-minute sleep cycles (7.5 hours), you need to be asleep by 8:30 PM. If you want a more forgiving nine hours, that means lights out around 7:00 PM. Set a wind-down reminder in the evening; the alarm only works if the bedtime does.
Consistency matters more than the number on the clock. Waking at 4:00 AM every day — weekends included — trains your circadian rhythm, and after a couple of weeks your body starts surfacing on its own. The alarm becomes a backup instead of a crowbar.
FAQ
- How do I set an alarm for 4:00 AM?
- Press Start above — the page counts down to the next 4:00 AM and plays a loud beep through your browser using the WebAudio API. Keep this tab open and your volume up. No download or signup needed.
- What time should I go to bed to wake up at 4:00 AM?
- To get 7.5 hours of sleep (five full 90-minute cycles), be asleep by 8:30 PM. For a full nine hours, aim for 7:00 PM. Add about 15 minutes for actually falling asleep.
- Will the alarm ring if my screen is off or the tab is closed?
- No — a browser alarm needs this tab open and the device awake. If the phone locks or the tab closes, the beep cannot play. For alarms that ring reliably even over the lock screen, use the AVA app.