Other durations
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About a 45 minutes alarm
45 minutes is long enough to drop into deep sleep but not long enough to complete a full 90-minute cycle, which is why naps of this length often feel worse than a 20-minute one. If you can, choose 20 minutes or 90 minutes instead.
The alarm is created as a one-time alarm at the exact clock time, so you can see it in the list above, rename it, or switch the sound. Keep this tab open with the volume up; on desktop it rings from a background tab, on a phone keep the page in the foreground and the screen stays on automatically.
Prefer a countdown?
If you want to watch the time tick down rather than set a clock time, use the 45 minute timer instead. Both ring with the same sounds.