The next day
How to wake up feeling refreshed
The short answer
Wake at the same time every day, give the night enough hours, get light within minutes of the alarm, and stand up rather than lying there. The heaviness is sleep inertia, a normal half hour while the brain switches on, and it fades by itself. What you can change is how long it lasts and how heavy it is.
The alarm goes and you're already negotiating. Five more minutes. Your legs feel poured from concrete.
You're up twenty minutes later. The kettle goes on, then the first coffee, which goes down without touching the sides. On the platform at 7.40am you're still not entirely in the building.
You start to wonder what's wrong with you. Nothing is. A slow first half hour is how nearly every human brain starts the day.
What varies is how long it lasts and how heavy it is. It shows up later, in the email you read three times and the morning that only begins at eleven.
Why you wake up groggy
Your brain doesn't switch on like a light. Blood flow to it stays below its waking level for up to half an hour. Thinking and reactions are slower, and your mood is flatter than it will be by ten.
Sleep scientists call this sleep inertia. It happens to everyone, after every sleep. In most lab studies performance is back to normal within 15 to 30 minutes; alertness can keep climbing for two hours.
Three things make it heavier: being short of sleep, waking when your body clock still thinks it's night, and probably waking from deep sleep, though the evidence on that last one is mixed.
A 2019 review in Nature and Science of Sleep put numbers on the first. People kept to 5.6 hours a night were 10% worse on tests the moment they woke. Seventy minutes later they were still below par.
One small study went further. People who'd slept a full eight hours did worse on an arithmetic test straight after waking than they did after a whole night without sleep.
So the first ten minutes aren't a verdict on your night. They're the brain changing gear, and it grinds in everyone.
How to feel more awake in the morning
- Wake at the same time every day, weekends included. Inertia is worst when the alarm goes off at a point your body clock still thinks is night. A fixed time keeps the two in step, so more often the alarm catches your body already getting ready. Work has already set your weekday alarm. What the weekend does with it is the part you control: the same time, or close to it. The NHS puts it plainly: wake up and get out of bed at the same time every day. We've set out why the wake-up time matters more than the bedtime.
- Give the night enough hours. Short sleep deepens sleep, and waking from deep sleep is probably part of what makes the first minutes worse. The NHS says adults need seven to nine hours. If you don't know where that puts your bedtime, work back from your alarm.
- Let light in before you're up, or within minutes. Light is what your brain reads as morning. In a 2010 trial, 16 people who struggled to wake used a lamp that brightened over the last half hour of sleep. They felt less sleepy on waking, though their test scores didn't change. Curtains open or a lamp on will do. A dawn-simulating alarm does the same job. Daylight is better still, and morning light has a second use for the night ahead.
- Get up and out of the warm. Lying still under the duvet keeps every signal of night running. Once you stand, your skin starts to cool, and that cooling goes along with feeling more awake. Window or kettle, as long as you're vertical.
- If you snooze, do it on purpose. A 2024 study put 31 regular snoozers through a sleep lab. Thirty minutes of snoozing cost them about six minutes of sleep. It kept them out of deep sleep for the final alarm, and their thinking on rising was the same or slightly sharper. So set one early alarm and one real one, half an hour apart, and stop apologising for it. The study didn't test an hour of alarms every ten minutes, so don't read it as permission for that.
- Don't judge the morning too early. The decisions you make in the first ten minutes are made by the groggy brain, and it's a pessimist. Skipping the walk and deciding you slept terribly can both wait until 7.30am.
What nothing on waking can do
There's no trick that cancels inertia. The same 2019 review found no clear evidence that anything done on waking reliably reverses it in measured tests. That includes light, sound and temperature.
Light helped people feel more alert in one study; it didn't make them perform better.
What the evidence does support is less exciting: less sleep debt and a steadier clock, so the alarm finds you in lighter sleep. The grogginess still comes, but it's shorter and lighter.
One more thing. If you've had enough hours every night for a few weeks and still wake exhausted, the NHS advice is to see your GP. Tiredness that doesn't lift with sleep has other causes worth checking.
Tomorrow's first half hour will still be slow; that part is biology. What you're changing is the load, and a fortnight of the same alarm is the quickest way to see how much of it was the night.
Read next
Questions
What does waking up groggy mean?
Usually only that you've just woken up. Grogginess in the first 15 to 30 minutes is sleep inertia, and everyone gets it. It's heavier after short sleep, when the alarm goes off at a point your body clock thinks is night, and probably after waking from deep sleep.
Why do some people wake up groggy and tired every morning?
The most common reason is a night that was too short or too irregular. Both make the groggy period longer and heavier. If it carries on for weeks despite enough sleep, the NHS advice is to speak to your GP.
What's the best way to wake up feeling rested?
Wake at the same time every day and get enough hours before the alarm, then find light within minutes of waking. None of it is dramatic; that's the point. The first half hour will still be slow, but shorter and lighter.
How do you feel more alert in the morning?
Get up as soon as the alarm goes and open the curtains or step outside. Then give it 30 minutes before you decide how the day is going. Any earlier means asking the groggy brain while it's still changing gear.
Sources
- Tiredness and fatigue, NHS, 2023
- Insomnia, NHS, 2024
- Sleep problems and insomnia self-help guide, NHS inform, 2021
- Sleep inertia: current insights, Nature and Science of Sleep, 2019
- Is snoozing losing? Why intermittent morning alarms are used and how they affect sleep, cognition, cortisol, and mood, Journal of Sleep Research, 2024
- Effects of artificial dawn on sleep inertia, skin temperature, and the awakening cortisol response, Journal of Sleep Research, 2010
This article is general information, not medical advice. If sleep problems last more than a few weeks, speak to your GP.
Was this helpful?
Thank you.