Why do I snooze even after 8 hours of sleep?
Sleep quality matters as well as quantity. Fragmented or poorly timed sleep, even at 8 hours, can leave you groggy enough to snooze. Sleep inertia is also worse when you wake from deep sleep.
Quality over quantity
Eight hours in bed with repeated wake-ups (alcohol-influenced, screen-disrupted) can leave you more tired than the number suggests. That is why sleep questionnaires such as the Pittsburgh Sleep Quality Index ask about both quality and duration.
Timing matters
If your alarm rings during deep N3 sleep, you can feel groggy even after a full night. Tassi and Muzet (2000) found that sleep inertia is worse when waking from slow-wave sleep than from light sleep.
Audit your sleep
Common culprits: alcohol close to bedtime, screens late at night, an inconsistent bedtime. Fix those first, and the snooze urge often fades.
Sources
- Hilditch & McHill, Nature and Science of Sleep, 2019. Sleep inertia: current insights
- Tassi & Muzet, Sleep Medicine Reviews, 2000. Sleep inertia
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