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Re:Ask HN: How Do You Sleep? by lgregg on Tuesday May 21, 2019 @11:28PM (#19977475)
I have found if I sleep with the room lights on or being woken up by the sun I feel much more rested.
Re:Ask HN: How Do You Sleep? by temny on Wednesday May 22, 2019 @01:37AM (#19978089)
In my experience sleeping with lights on causes more shallow sleep. I confirm it is easier to wake up, but after several days in a row I felt more tired than usually.

I found that blocking all sources of light during sleep and using light to make it easier to wake up works best for me.