One of my relatives has a fluctuating schedule that all too often means less than 6 hours of sleep a night, going to bed at 4am, "waking up late", trying to make up for it on the weekends, etc. Doesn't eat great but doesn't eat horribly. Exercises some. Doesn't wash with anything but water and whatever crap cleanser has nice packaging at Wal-Mart. Is not on birth control or other hormonal therapies. Never had a pimple in her life.
Yes, sleep, like everything else (diet, natural hormone levels, stress), is a factor in acne. But, like everything else, it is not the one sole deciding factor in acne. Acne isn't "caused" by one thing or another, it CAN be caused by a combination of things depending on the person's body chemistry.
I notice that my skin is oilier when I wake up from sleep, period. I've pulled a few all-nighters in my life, and there was nothing like NO sleep to give me DRY sallow skin with no new pimples. It was the one good thing about an all-nighter...at least I didn't have more zits to contend with.
Edited by Green Gables, 29 June 2013 - 12:42 AM.