Why You Sleep Through Your Alarm and What Actually Helps

A common reason you sleep through your alarm is not getting enough sleep: it makes you harder to wake, especially from deep sleep. And a simple swipe can be done without really waking up. What helps: sleep enough, go easy on alcohol at night, and use an alarm that takes a physical action to turn off.

In deep sleep, also called slow-wave sleep or stage N3, you respond less to the outside world, and it’s harder to wake you, according to the Sleep Foundation. How easily sound wakes you also varies from person to person. A 2010 study in Current Biology found that people whose brains produced more sleep spindles, brief bursts of brain activity during sleep, stayed asleep through more noise.

Being short on sleep makes it harder still. A sleep-deprived body prioritizes recovery over your schedule.

Not getting enough sleep is a common cause. The American Academy of Sleep Medicine and the Sleep Research Society recommend at least seven hours a night for adults. If you consistently get less, sleep debt builds up and your alarm has more to fight against.

Alcohol and sleeping pills make it harder too. Alcohol increases deep sleep in the first half of the night, according to a 2013 review in the journal Alcoholism: Clinical and Experimental Research. And a 2007 review in the journal Human Factors, on who sleeps through smoke alarms, lists sleep deprivation, alcohol, and sleeping pills among the risk factors. Untreated sleep apnea, depression, and some medications can also lead to oversleeping, according to the Cleveland Clinic.

Sound alone has limits, for all the reasons above. And easy dismiss gestures (swipe or tap) can be done half-asleep, before you’re really awake.

Gradually increasing volume still leaves room to dismiss it half-asleep. By the time the alarm reaches full volume, you may have already silenced it without really waking up.

Kairo’s alarm is hard to dismiss half-asleep: you turn it off by completing a short mission. With a photo mission, the alarm keeps going until AI checks your photo, which usually means getting up, aiming, and taking the shot.

Place your phone where you must stand to reach it. The combination of relocation plus a photo mission creates a two-factor wake-up system that is very hard to sleep through. Then the photo does one more job: it’s your proof for the morning, and your friends see it.