The alarm rings, and you reach for snooze. The science is more complicated than your boss thinks.

It's 6:47am. The alarm goes off and you don't really hear it — you hear the idea of it. Your hand moves before your brain does. Tap. Nine more minutes. The room is dim, the body is heavy, the meeting is in two hours, and you do this every morning of your life.

You are not the only one. In fact, you are barely even in the minority.

More than half of us, every morning

In May 2025, a team led by Rebecca Robbins at Mass General Brigham published the largest study ever done on this exact small moment. They analysed more than 3 million nights of sleep logged by over 21,000 people on a global sleep app, and counted what happened at the very end of each one. The result: 55.6% of all sleep sessions ended with a snooze alarm. ^[1]

On the nights people snoozed, they hit it 2.4 times on average and spent about 11 minutes caught between alarms. ^[1] If you snooze most weekdays, that's roughly an hour of fragmented sleep a week — close to a whole night of it a month — that wasn't really sleep and wasn't really being awake.

The pattern wasn't random. Snoozing went up on weekdays and down on Sundays. ^[1] It went up when people had gone to bed later than usual, and down when they'd gone to bed early. ^[1] Sweden snoozed most. Japan snoozed least. The shape of the data is the shape of a population trying, every Monday, to take back the thirty minutes the week already stole.

The boss-friendly take is half right

You have probably heard the productivity advice. Don't hit snooze. Get up with the first alarm. Discipline. Some of it is grounded in real science: when the snooze alarm pulls you back under, the brain returns to lighter, fragmented sleep, and the hour just before waking is rich in REM — the stage that does the heaviest work for memory and mood. Robbins put it plainly in the paper's press: "Any sleep you get after hitting snooze is just light, fragmented sleep."

A 2022 study in Sleep by Mattingly and colleagues found that snoozers had lighter sleep in the hour before waking and higher overnight resting heart rate than non-snoozers. ^[3] Snoozers were more often female, younger, evening chronotypes, and people whose sleep was already disturbed. ^[3] So far, the lecture seems to check out.

Here is what the lecture leaves out.

The same Mattingly paper found that snoozing did not reduce total sleep duration, did not increase daytime sleepiness, and did not increase the need to nap. ^[3] The cost was real but it was textural, not catastrophic. And then in 2024 a Karolinska Institute group around Tina Sundelin ran the cleaner test: a laboratory study with full polysomnography, in 31 habitual snoozers, comparing a normal abrupt wake to a planned 30 minutes of snoozing before final rise. ^[2]

The cognitive tests, taken immediately on getting up, were either the same or better on the snooze mornings. ^[2] Subjective sleepiness and mood didn't move much in either direction. The snooze sleep was lighter, yes — but crucially, it kept the body from being yanked straight out of deep, slow-wave sleep, which is the worst state to wake from. The researchers' conclusion was careful and quietly subversive: a short morning snooze "may be beneficial in relieving sleep inertia and improve cognitive functioning right upon waking." ^[2]

What's actually happening at 6:47am

Sleep inertia is the dazed, half-functional state in the minutes after waking. It is worst when an alarm rips you out of deep slow-wave sleep — the kind that dominates the early-night hours but can creep back if you went to bed late. It is mildest when you wake at the natural end of a sleep cycle, in lighter REM.

So the snooze button is doing something specific. It's lengthening the runway. The first ring nudges you out of deep sleep into light sleep. The next nine minutes let your body finish the cycle so the real wake-up happens from a stage you can climb out of. That's the mechanism behind the Sundelin finding. It's also why snoozing on a normal night feels different from snoozing after five hours of sleep on a Tuesday — the architecture underneath isn't the same.

The real signal in the 2025 data is not that snoozing is shameful. It's that snoozing is a downstream symptom of bedtime. People who went to bed earlier snoozed less. People who got the long sleep — more than nine hours — snoozed more, suggesting the body was deep in slow-wave when the alarm hit and needed runway. ^[1] The morning negotiation is the night's bill arriving with a small surcharge.

What to do tomorrow morning

You don't need a new app or a colder bedroom. You need one of two small moves — pick whichever your week actually allows.

Move one (the structural fix): set your bedtime alarm 30 minutes earlier than your wake alarm. The body's preference is consistency at the front of the night, not heroics at the back. If you regularly snooze on weekdays, you are probably going to bed 30 minutes later than you needed to. Move the bedtime, and the morning fights back less.

Move two (the kinder snooze): if you're going to snooze anyway, set one extra alarm — exactly one — for 25 to 30 minutes after the first. That's the Sundelin window. Long enough to ride out the cycle and not get yanked straight out of slow-wave. Then, on the second alarm, get up. Light into your eyes within sixty seconds, feet on the floor, water before phone.

Either way, before you swing your legs out, do one round of slow exhale breathing — 4 in, 7 hold, 8 out. The long exhale shifts your nervous system from drowsy parasympathetic into low alert. It takes the edge off sleep inertia in about twenty seconds.

You don't have to win the morning. You just have to leave it without it costing the rest of the day.

The reframe

You were not being weak when your hand moved to the snooze button. You were not failing some morning-person test. You were a tired body, in the middle of a sleep cycle, doing the only useful thing it knew how to do — buy itself ten more minutes to land softly.

The fix isn't to punish that body harder. The fix is to give it a bedtime that doesn't make the morning a renegotiation.

That's the whole game. The alarm tomorrow doesn't have to be a war. It can be the quiet end of a night you actually finished.

Tonight

Pick a bedtime that is 30 minutes earlier than your usual one. Set a reminder for it on your phone. Then, in the morning, try one snooze — no more — and get up on the second ring with the first thing you do being light into your eyes. One night, one morning. See what the body says.