Sleep Timer
Set a sleep timer for 15 to 90 minutes or choose a custom duration. The low-glare countdown stays in your browser and can end with a gentle chime.
Remaining
30:00
Ready when you are.
· Free
Track it in Bedtime Reminder.
Keep sleep routines, reminders and personal notes private on your device.
How this sleep timer works
This sleep timer uses timestamps to calculate the remaining duration, so background-tab throttling does not make the countdown drift. Choose a preset or enter custom minutes, then use the dim mode for a low-glare bedside display.
Adults need 7 or more hours of sleep per night. This timer is a simple countdown tool, not sleep advice; use it to end audio or a routine at a time that suits you.
remaining time = duration − (current timestamp − start timestamp) Sleep timer FAQ
What is a sleep timer?
A sleep timer counts down for a chosen duration and provides a quiet completion state when time is up.
Can I use a custom duration?
Yes. Choose one of the 15, 30, 45, 60 or 90 minute presets, or enter any positive number of minutes.
Why does the timer use timestamps?
The remaining time is derived from timestamps rather than counting interval ticks, so throttled background tabs do not determine the elapsed duration.
What does dim mode do?
Dim mode lowers visual contrast and hides the controls and status text, leaving only the remaining time visible for bedside use.
Does the timer save my duration?
No. The timer runs in your browser and does not require an account or network connection.