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[EdReedFan20]

So, when you sleep, you have sleep cycles (https://en.wikipedia.org/wiki/Sleep#Stages). The cycles continue several times throughout the night. So, sometimes people wake up and feel like they had a good night sleep, but then look at their alarm clock and see they woke up well before the alarm was set to go off. So, what would you do? Wake up earlier than you planned? Go back to sleep until the alarm goes off? If the latter, you risk waking up in the middle of a sleep cycle, which would make you feel very tired and groggy. I suppose if there is a downside to waking up early, it's being tired earlier at night. For me, if it is close to when my alarm was set to go off, I just wake up. Otherwise, I go back to bed.

 

[Quikies83]

Yup. I use this site to predict what time I should wake up: http://sleepyti.me/

 

[NoblesseOblige]

Experimented in college with polyphasic sleep and found out that planning to sleep in increments of 90 minutes guaranteed I always woke 10-20 minutes before my alarm. Since then I have woken 95+% without the need of aggressive disruption from an alarm. Which basically means I'm not groggy in the mornings.

Edit: Also mastered the art of the <20 minute power nap.

 

[esmith08734]

Yup. I use this site to predict what time I should wake up: http://sleepyti.me/

Thank you for this!

 

[EdReedFan20]

Yup. I use this site to predict what time I should wake up: http://sleepyti.me/

Neat! Turns out I was already going by this thing without knowing it existed ;p

 

[Kisaya]

My body loves to wake up just minutes before my alarm goes off, lol. I've contemplated not using the alarm but I don't want to risk it!