Human sleep cycles last 75-90 minutes, when you hit snooze for an extra 9 minutes sleep you enter another sleep cycle.

When the snooze alarm triggers and you wake again after 9 mins into that new sleep cycle, you activate what’s called sleep inertia.

Sleep inertia impairs cognitive function and has similar symptoms to being drunk.

It takes the brain up to 4 hours to get through this groggy sleep feeling. For some their concentration will be affected throughout the day.

Studies show adults who wake up naturally and slept longer require less caffeine during the day or stimulants and can maintain the waking state more effectively for longer periods of time, showing signs of increased overall happiness.

If you’ve been waking up feeling tired, reconsider hitting snooze for that extra 9 minutes of sleep.

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