Set Alarm for 4:00 PM
A free online alarm clock preset to 4:00 PM. Press Start, leave this tab open, and it will ring at 4:00 PM sharp.
Keep this tab open. For alarms that work with your phone locked, get AVA.
Waking up at 4:00 PM
A 4:00 PM alarm marks the pivot from day to evening: the end of a night worker's main sleep, a pre-gym wake-up after an early start, or the last possible minute a nap can end without wrecking tonight's bedtime. Whatever it protects, late-afternoon sleep is deep — set the volume accordingly.
An alarm for 4:00 PM usually means one of two things: you are protecting a power nap, or your schedule does not follow the nine-to-five script — night shifts, split shifts, or work that starts when other people's afternoons wind down.
If this is a nap alarm, keep it short or go long: either 20–25 minutes (you stay in light sleep and wake refreshed) or a full 90-minute cycle. Anything in between tends to end mid-deep-sleep and leaves you foggier than before you lay down. Starting the countdown to 4:00 PM the moment you lie down makes that decision for you.
If you are on nights and 4:00 PM is your morning, treat it like one: blackout curtains until the alarm, then bright light, water and real food right after. Your body clock takes its cues from what you do in the first half hour after waking, whatever the wall clock says.
FAQ
- How do I set an alarm for 4:00 PM?
- Press Start above — the page counts down to the next 4:00 PM and plays a loud beep through your browser using the WebAudio API. Keep this tab open and your volume up. No download or signup needed.
- How long should a nap be if I want to wake at 4:00 PM?
- Count backwards from 4:00 PM: lie down 20–25 minutes before for a light power nap, or a full 90 minutes before for one complete sleep cycle. Both beat the 45–60 minute middle ground, which usually ends in deep sleep and grogginess.
- Will the alarm ring if my screen is off or the tab is closed?
- No — a browser alarm needs this tab open and the device awake. If the phone locks or the tab closes, the beep cannot play. For alarms that ring reliably even over the lock screen, use the AVA app.
Nearby alarm times
All alarm times · How much sleep do I need? · Sleep inertia explained · Oversleeping: causes and fixes