Sleep makes a huge difference.
When I sleep adequately, 8 hours per day plus a short nap, my skin looks noticeably better. Plus it doesn't cost anything but your time. But it's time well spent! You have almost nothing to loose and much to gain. Cycles of hormones is largely effected by circadian rhythm, sleep well = hormones are well. Less stress, cortisol aggravates acne. When you sleep too much I notice my skin looks worse, 9HRS+ When I sleep in irregular patterns, like long naps or irregular hours, my skin looks worse. During my high school years, when I got severe acne, I never had good sleeping habits and I regret it a lot. Now, years later, I try to sleep well. at least 7 to 8 hours per night around the same time plus half an hour to an hour of nap after work. The nap reduces my stress and cognitive load and makes me feel as if I have two days. My adequate sleep makes me feel wonderful. Whenever I fall out of this routine, I instantly notice my skin looks worse. I love when I go to sleep and wake up seeing a pimple significantly reduced in size. There is significant evidence based on research that indicates how important sleep is towards memory, health, happiness, mental strength, etc. It contributes significantly towards well being.