Set the alarm clock for 5:36 am

Leave this tab open — the alarm only rings while the tab stays open.

The alarm goes off in: ::

You can also try the other alarm clocks

Alarm clock for 5:34 am Alarm clock for 5:35 am Alarm clock for 5:37 am Alarm clock for 5:38 am

Going to bed for a 5:36 am alarm

Asleep by 8:21 pm — 6 full sleep cycles, about 9 hours
Asleep by 9:51 pm — 5 full sleep cycles, about 7 hours
Asleep by 11:21 pm — 4 full sleep cycles, about 6 hours

A sleep cycle runs about 90 minutes, and most people take around 15 minutes to drop off. Waking at the end of a cycle feels easier than waking in the middle of one.

5:36 am across the country

London	5:36 am
Birmingham	5:36 am
Manchester	5:36 am
Glasgow	5:36 am
Belfast	5:36 am

Times are worked out live in your browser, so daylight saving is already accounted for.

How to use the online alarm clock

Midway through checking the rail replacement timetable, a 5:36 am alarm gives you a clear reason to break off and look away from the schedule. There are 24 minutes before 6:00 am, enough to confirm the affected service, note the replacement bus stop and leave any less urgent details until later.

Your railway timetable check can stay on screen alongside this alarm, but closing its browser page ends the alarm, and it cannot sound if the phone or computer goes to sleep. Keeping the page open and the device awake means the alert can interrupt the task at 5:36 am as intended. The volume should also be set high enough to be heard without making the alert unnecessarily harsh in a quiet room.

A rail check this early often happens while the house and street are still unusually quiet, so an ordinary alert may seem much louder than it would later in the morning. Set a moderate volume, place the device within easy reach and avoid leaving it beneath bedding or paperwork. As traffic and household sounds begin to build towards 6:00 am, having the device nearby makes the alarm easier to notice without relying on maximum volume.

Common questions

Does the alarm still work if I close the tab?

No. Everything runs inside this page, so closing the tab — or quitting the browser altogether — ends the countdown there and then. Leaving it open in the background is all it asks, and switching to another tab makes no difference.

What happens if my laptop goes to sleep before 5:36 am?

The tab sleeps along with it and the alarm will not sound on time, if at all. If you are relying on it, change the power settings so the machine stays awake, or keep a phone alarm running as well.

Do I need an account or an app?

Neither. Choose a time and a sound, press Start, and it runs in this browser tab. Nothing is downloaded, nothing is registered, and closing the page leaves nothing behind on the device.

Can I change the sound?

Yes, there is a short list of tones to pick from before you press Start. Softer sounds are easy to sleep through, so a firmer bell tends to be the safer choice for anything early in the morning.