Free alarm
Wake me up in 30 minutes
The alarm below is already set to 30 minutes from now — press Set alarm and leave this tab open. Below, what a 0h 30m sleep actually does, and how to come out of it well.
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30 to 60 minutes is the danger zone
Somewhere past the half-hour mark, your brain starts descending into deep sleep — and an alarm that lands there produces sleep inertia: that heavy, worse-than-before grogginess that can hang around for a long while after waking. This is why an hour's nap so often feels like a mistake even though it was more sleep than a 20-minute one.
If you have the time flexibility, moving the alarm is usually better than keeping it here: shorten to 20–25 minutes and stay in light sleep, or stretch to 90 and finish a full cycle. Keep a wake-up in this range when the schedule demands it — a gap between meetings, a train to catch — and plan for a slow first ten minutes after the alarm: light on, stand up, water, movement.
One honest caveat: people differ. Some drop into deep sleep faster than others, and a tired brain descends faster than a rested one. The more sleep-deprived you are, the more this window will hurt — and the more you need the alarm to be one you cannot silence half-asleep.
Waking up from it
Whatever the length, the last step is the same: the alarm has to end with you upright. A browser alarm's Stop button is one click away, and one click is well within reach of a brain that is still mostly asleep — which is fine for a desk nap and risky for anything you genuinely must wake up from.
If the stakes are real — a shift, a flight, an exam — put the alarm on your iPhone across the room instead. WakeUpBroo has no snooze and no dismiss button; it stops only when you type a rotating code from wakeupbroo.com/code on the screen you left over here. The walk is what actually ends the sleep.
Other durations
Shorter on time? Try wake me up in 25 minutes. Got longer? See wake me up in 45 minutes. For a wake-up at a specific clock time, use the online alarm clock or jump straight to a time like 6:00 AM.
FAQ
Frequently asked questions
Is 30 minutes enough for a nap?
It's the awkward length. After about 30 minutes you start entering deep sleep, and an alarm landing there causes sleep inertia — waking groggier than you lay down. If you can, shorten to about 20 minutes or stretch to 90 for a full cycle.
Will this 30 minutes alarm work if I close the tab?
No. A browser alarm only runs while the page is open, so leave the tab open, keep the computer awake, and check the volume with the test button before you rely on it.
Does the timer start from when I press start or when I fall asleep?
From when you press start. If you usually take ten minutes to fall asleep, you'll sleep about ten minutes less than the alarm length — worth remembering for short naps, where those minutes are most of the nap.
What if I sleep through the alarm?
A browser alarm stops with one click, which a half-asleep brain manages easily. If you regularly sleep through naps or alarms, use one that can't be dismissed from where you're lying — WakeUpBroo for iPhone has no snooze and no dismiss button, and stops only when you type a rotating code from wakeupbroo.com/code on another device.
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Naps end. Mornings are the hard part.
If you can sleep through anything, the morning alarm needs to be one you can't silence from bed. WakeUpBroo has no snooze and no dismiss button — it stops only when you read a rotating code from this website on another device. Free to download, 7-day free trial.
Free on iPhone · Android in development