Set alarm for 4:15 AM
Recently used Functions
| Alarm 11:59 AM | 11:59 AM |
| Alarm 11:59 PM | 11:59 PM |
| Alarm 6:00 AM | 6:00 AM |
| Alarm 7:00 AM | 7:00 AM |
| Alarm 8:00 AM | 8:00 AM |
| Alarm 9:00 AM | 9:00 AM |
| Alarm 10:00 AM | 10:00 AM |
| Alarm 12:00 PM | 12:00 PM |
| Alarm 7:55 PM | 7:55 PM |
| Alarm 6:55 PM | 6:55 PM |
Bedtimes for a 4:15 AM alarm
Sleep moves in cycles of roughly 90 minutes, and falling asleep takes most people about 15 minutes. Counting back from 4:15 AM, these times land a wake-up at the end of a cycle rather than in the middle of one.
| 7:01 PM (the night before) | 6 sleep cycles | 9 hours of sleep |
| 8:31 PM (the night before) | 5 sleep cycles | 7.5 hours of sleep |
| 10:01 PM (the night before) | 4 sleep cycles | 6 hours of sleep |
These are planning figures, not medical advice — cycle length varies between people and from night to night.
What 4:15 AM looks like elsewhere
Four in the morning suits long drives, fishing trips, and flights that board before sunrise.
| 12-hour clock | 4:15 AM |
| 24-hour clock | 04:15 |
| Military time | 0415 |
| Relative to midday | 7h 45m before midday |
| Since midnight | 255 minutes (18% of the day) |
| Until midnight | 1185 minutes |
If you set this alarm right now it would ring in about 19h 36m, tomorrow.
4:15 AM alarm — common questions
What time do I need to sleep to wake up at 4:15 AM?
To get about 7.5 hours you would fall asleep around 8:31 PM, or 7:01 PM for a fuller 9 hours. Both allow roughly 15 minutes to drop off and finish on a complete sleep cycle.
What is 4:15 AM in 24-hour time?
4:15 AM is 04:15 on a 24-hour clock, written 0415 in military and aviation formats. It sits 7h 45m before midday and 255 minutes after midnight.
Will this 4:15 AM alarm work if I close the tab?
No. The alarm runs in the page, so the tab has to stay open, though it can be in the background and it keeps working without an internet connection once loaded. Bookmark the page and the 4:15 AM setting is restored when you open it again.
How the 4:15 AM alarm works
The alarm here is already loaded with 4:15 AM; one press of Set Alarm arms it. A live countdown shows the time remaining, and saving this page as a bookmark stores the 4:15 AM setting for next time.
Set the hour and minute for the online alarm clock. Once you set the hour and minute for the online alarm clock, the alarm message will appear, and the preselected sound will play at the set time. You can also click the 'Test' button to preview the alert and check the sound volume.
You can customize the alarm clock's appearance, including text color, type, and size, and these settings will be saved for the next time you open your web browser.
The online alarm clock won't work if you close your browser or shut down your computer, but it can work without an internet connection. This free online alarm clock will reliably wake you up.
You can add links to online alarm clocks with different time settings to your browser's Favorites. Opening one of these links will automatically set the alarm clock to the predefined time.