Set the alarm clock for 4:38 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 4:36 amAlarm clock for 4:37 amAlarm clock for 4:39 amAlarm clock for 4:40 am
All alarms from 4:00 am to 4:59 am →

Going to bed for a 4:38 am alarm

  • Asleep by 7:23 pm — 6 full sleep cycles, about 9 hours
  • Asleep by 8:53 pm — 5 full sleep cycles, about 7 hours
  • Asleep by 10:23 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.

Related tools

Online timerOnline stopwatchCountdownDate calculatorsCalendar and datesPublic holidaysAll tools →

How to use the online alarm clock

You are wrapping up the night shift at Jebel Ali Port, clearing the last handover notes and getting ready to leave. An alarm for 4:38 am marks the moment to finish rather than begin another task. With 5:00 am approaching, there is still time to return shared equipment, sign out and head towards the exit without letting the shift drift into the next hour.

A quiet Jebel Ali handover changes what the alarm needs to do. A soft tone may be enough in a calm office or control room, while a more persistent sound can suit a noisy operational area where machinery and conversations mask alerts. The chosen tone should be recognisable without disturbing colleagues unnecessarily. Keep a separate phone alarm as backup: this browser alarm may stay silent after its page is dismissed or the handset sleeps, which could delay the end of your port shift.

Leaving Jebel Ali before dawn often means lighter traffic than the daytime flow, but the journey can still vary around port gates, lorry routes and Sheikh Zayed Road. Checking the route shortly before 4:38 am gives a more useful travel estimate than relying on the usual daytime duration. Allow a small buffer for the walk to parking, security exits and any road works encountered on the way home.

Common questions

Can the alarm ring if this tab is no longer open?

Think of the browser tab as the alarm's running space: once that tab is closed, the alarm scheduled for 4:38 am can no longer continue. It does not need to stay visible, so you may minimise the window or browse elsewhere.

Will my alarm work once I have closed the tab?

No, closing the page stops the alarm rather than leaving it active in the background. For an alert at 4:38 am, keep that particular tab open; it can sit behind other tabs or inside a minimised browser window.

Does the tab need to stay open for the alarm?

Your device will not take over the alarm after the webpage closes. The tab containing the alarm for 4:38 am needs to stay loaded until it rings, although you are free to switch windows, check another site, or minimise the browser.

After closing this tab, can I still hear the alarm?

If you close the tab before 4:38 am, the alarm will not go off because its countdown ends with the page. The tab may remain out of view while you use another one, but the browser and alarm page must stay open.