UK Time

Set Alarm for 5:45 am

An alarm pre-set for 5:45 am. It will ring .

Keep this tab open for the alarm to ring — browsers can't fire sound while a tab is fully closed.

05:45 AMAlarm 5:45 am

About a 5:45 am alarm

A 5 am alarm suits early commuters, shift workers heading for airports and anyone fitting exercise before work. It is before dawn for much of the year, so a lamp or a sunrise-style light helps. A quarter-to time gives you a short run-up to anything that starts on the hour. It suits people who prefer a quick start, such as a fast breakfast and an immediate commute, and it is often used by those who want the last possible moment of sleep without being late.

In London the sun is already up at 5:45 am in May, June, July and August. It is still dark, or already dark, at that time in January, February, March, April, September, October, November and December.

When to go to bed for a 5:45 am alarm

Sleep runs in roughly 90-minute cycles, and waking at the end of one tends to feel easier. These bedtimes include about 15 minutes to fall asleep.

  • Bed at 20:30 for 6 cycles (9 hours of sleep)
  • Bed at 22:00 for 5 cycles (7.5 hours of sleep)
  • Bed at 23:30 for 4 cycles (6 hours of sleep)

Frequently asked questions

What time should I go to bed to wake at 5:45 am?

Allowing about 15 minutes to fall asleep, bedtimes of 20:30 (9 hours), 22:00 (7.5 hours) or 23:30 (6 hours) line up with 90-minute sleep cycles.

Will the alarm ring if I close the tab?

No. Keep this tab open, in the background is fine, and turn the volume up. The alarm uses your device's own clock.