Set the alarm clock for 11:43 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 11:41 am Alarm clock for 11:42 am Alarm clock for 11:44 am Alarm clock for 11:45 am

Going to bed for a 11:43 am alarm

Asleep by 2:28 am — 6 full sleep cycles, about 9 hours
Asleep by 3:58 am — 5 full sleep cycles, about 7 hours
Asleep by 5:28 am — 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.

11:43 am across the country

Sydney	11:43 am
Brisbane	11:43 am
Adelaide	11:13 am
Perth	9:43 am
Darwin	11:13 am

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

Online alarm clock for 11:43 am

While preparing for fasting blood tests at the laboratory, set the 11:43 am alarm now so it is ready before you need it. That leaves a clear marker ahead of 12:00 pm, whether the alarm is meant to prompt your departure, signal the end of a waiting period, or keep the morning from slipping away while you gather your referral and keys.

Give the alarm a quick trial while there is still time to correct the sound level. Set a temporary alarm a minute ahead, keep the browser running, and listen for the alert from the same phone or computer you intend to use later. A browser alarm cannot sound after its running session is closed or the device goes to sleep, so your laboratory timing should also have a separate backup if missing the alert would disrupt the trip.

Because 11:43 am sits near the end of the morning, think about how much sleep you expect to get after the alarm rather than treating it as an isolated interruption. If you plan to rest beforehand, place your clothes, paperwork and transport essentials together first; that makes waking less abrupt and reduces the chance of lying awake rehearsing what still needs doing. Keep the room dim and leave enough time after the alert to become properly awake before heading out.

Common questions

Is there a cost to use this?

No, it's free, with no sign-up and no limit on how many times you set it. It just needs the tab left open until the time you've chosen arrives.

Will the alarm still ring if I close the browser tab?

No. The alarm only runs while this tab stays open — closing it, or closing the browser entirely, stops the countdown before it can ring. Keep the tab open in the background if you need it to go off later.

Does the alarm work if my laptop goes to sleep?

Not reliably. If the device sleeps or the screen locks, the browser tab pauses along with it, so the alarm may not fire on time or at all. Adjust your power settings if you're relying on this over a longer stretch.

Do I need to create an account or download anything?

No, there's nothing to sign up for and nothing to install. Pick a time and a sound, press Start, and it runs entirely in this browser tab.