How Many Alarms Should You Set? The Case for Just Two

If you're asking how many alarms you should set, you've probably already got four or five lined up at ten-minute gaps. It feels safer. In practice, it means waking badly several times instead of once. This guide covers what the research says about snoozing and stacked alarms, the two-alarm rule, where to put your alarm, and who genuinely needs a backup.

The short answer: set one alarm for the time you actually need to get up, and one backup 10 to 15 minutes later that is different in kind (a different device, or one across the room). That's it. A row of alarms trains you to ignore alarms, and every one you sleep through is sleep you're not really getting. If you've needed five alarms for years, the fix is an earlier bedtime and a steadier wake-up time, not a sixth alarm.

Why people set five alarms

Almost everyone who stacks alarms does it for one of three reasons:

• They've slept through one before and don't trust a single alarm any more.
• They snooze, so the alarms are really a snooze cycle with extra steps.
• They're going to bed too late for the time they need to get up, and the alarms are compensating.

The first reason is worth taking seriously. The other two are problems alarms can't solve. If you regularly sleep through alarms, start with why can't I wake up to my alarm?

What snoozing and stacked alarms actually do

The evidence is more nuanced than the headlines.

A 2023 Stockholm University study in the Journal of Sleep Research surveyed 1,732 people, then put 31 regular snoozers through two nights in a sleep lab: one morning with 30 minutes of snoozing, one getting up at the first alarm. Snoozing cost them only about six minutes of sleep, with no clear effect on mood, sleepiness or cortisol. The snoozers even did slightly better on cognitive tests straight after waking, probably because the final alarm was less likely to catch them in deep sleep (source). The same researchers noted that regular snoozers sleep slightly less and feel drowsier in the morning than people who never snooze.

A much larger 2025 study led by Harvard Medical School researchers, published in Scientific Reports, looked at more than three million nights from a sleep-tracking app. Close to 56 per cent of sleep sessions ended with a snooze alarm, averaging about 11 minutes. Heavy users, who snoozed on more than 80 per cent of mornings, lost about 20 minutes a day. The lead researcher pointed out that the hours before waking are rich in REM sleep, and snoozing interrupts it and typically gives you only light sleep in return. Their advice: set the alarm for the latest possible time and get up when it first goes off (source).

Put together: half an hour of snoozing won't wreck your day, but it isn't rest either. Every extra alarm in a stack is time you could have spent properly asleep, and the more alarms you have, the less any single one means. For ways out of the cycle, see how to stop hitting snooze.

The two-alarm rule

1. Alarm one: the real time. Set it for when you need to be out of bed, not 40 minutes early "to ease into it". Easing in is snoozing with a different name.
2. Alarm two: the backup. Set it 10 to 15 minutes later, and make it different from the first. If the first is on your wrist, the second is a phone or clock across the room. Two identical alarms on the same phone fail in the same way.
3. Nothing else. If you find yourself adding a third, ask what you're compensating for. Usually it's bedtime. See what time should I go to bed?

Set the alarms once and leave them. Changing times every night makes it harder for your body clock to settle, and a steady wake-up time is what eventually makes the backup unnecessary.

Where to put your alarm

Placement	Good for	Downside
Phone beside the bed	Convenience	Easiest to snooze half asleep; wakes a partner
Phone or clock across the room	Forcing you upright	Loud for everyone else in the house
Vibrating wristband	Waking you alone, quietly, even with earplugs in	Needs charging now and then
Bed shaker under the mattress	Very heavy sleepers	Shakes the whole bed, partner included
Phone under the pillow on vibrate	Quiet wake-ups	Slides away overnight and often isn't felt

A good pairing is one alarm on you and one across the room. The one on you wakes you without waking anyone else. The one across the room only goes off if the first didn't work, and when it does, you have to stand up to stop it.

Who genuinely needs a backup

A backup alarm is sensible, not paranoid, if:

• The cost of oversleeping is high. An early flight, an exam, the first day of a job, a 4am start. See how to wake up for an early flight.
• You're a very heavy sleeper who has slept through alarms before. See do vibrating alarms work for heavy sleepers?
• You're short on sleep, after a late night or a run of shifts. Sleep-deprived people sleep deeper and are harder to wake.
• You rely on one device that could run flat or be silenced by a software setting.
• Alarm worry keeps you awake. If you lie there checking the alarm is set, a backup you trust can quiet that. See alarm anxiety.

What nobody needs is five alarms every day. If that's your normal, the backup has become the system.

How to stop needing a row of alarms

• Fix the wake-up time first. Same time every day, weekends included. Within a couple of weeks you'll wake near the alarm anyway.
• Count backwards to bedtime. Most adults need 7 to 9 hours. If the alarm is at 6am, lights out needs to be around 10pm.
• Get up at the first alarm for a week. It's unpleasant for about three mornings. After that it's mostly habit.
• Use morning light. Open the blinds or step outside within a few minutes of waking.
• Put the backup out of reach so stopping it means standing up.

This guide is general information, not medical advice. If you can't wake despite plenty of sleep, or you're very sleepy during the day, talk to your GP.

Where the Sovune Nudge fits

We make the Sovune Nudge, a silent alarm wristband, so we're not neutral. It's built to be "alarm one" in a two-alarm setup:

• It wakes you with vibration on your wrist, starting as a gentle tap and building through three intensity levels.
• Each alarm runs for a full minute, stepping up in strength rather than playing one fixed sound.
• Three separate alarms, set on the band itself with no app and no phone.
• No sound and no light in the room, so your backup across the room is the only thing anyone else will ever hear, and only if the first alarm didn't work.
• Up to 14 days of nightly use per charge.

It comes with a 30-day money-back guarantee.

Quick answers

How many alarms should I set? Two. One at the time you need to get up and a different kind of alarm 10 to 15 minutes later as a backup.

Is snoozing bad for you? The evidence is mixed. A 2023 lab study found 30 minutes of snoozing cost regular snoozers only about six minutes of sleep, but a large 2025 study found heavy snoozers lose around 20 minutes a day of mostly light, interrupted sleep.

Should I set my alarm earlier so I can snooze? No. Set it for the latest time you can actually get up, then get up.

Why do I sleep through all my alarms? Usually too little sleep, an irregular schedule, or alarms you've learned to tune out. A vibrating alarm on your wrist is harder to ignore than a sound you're used to.

For every type of silent alarm compared, see our complete guide to vibrating alarms in Australia.

See the Sovune Nudge →