Definition
- Snooze
- Snooze is an alarm function that silences the alarm temporarily and repeats it after a short interval, most commonly nine minutes. It was introduced as a mechanical convenience rather than designed around sleep physiology, and repeated use tends to leave people less alert, not more.
Why nine minutes?
The interval is a legacy of mechanical clock design: the gearing in early snooze mechanisms made a sub-ten-minute interval the practical choice, and the convention stuck when clocks went digital.
Why it usually backfires
Falling back asleep for a few minutes can start a new sleep cycle that you then interrupt, producing sleep inertia on top of the sleep inertia you already had. The fragmented sleep between snoozes is also of poor quality, so it provides little recovery.
The evidence is not uniformly against short snoozing for everyone, but repeated snoozing across half an hour or more is reliably worse than setting the alarm for the later time and sleeping continuously until then.