great night sleep

How A Good Sleep Cycle Depends On Eyes And Lighting

Q&A site Quora. Photo: Quora This question originally appeared on Quora. Answer by Suzanne Sadedin . Your sleep cycle is primarily regulated by circadian clocks that drive rhythmic fluctuations in hormone levels. Humans have several of these, but we only really understand the main one, which is in your hypothalamus, way down near the base of…