Decoding the Science of Sleep

Do you know naturally we used to have first sleep ( from after darkness to around midnight, wake-up and then have a 2nd sleep)?

Check this article.

In a new branch of sleep medicine, scientists have identified how to get a good night's sleep naturally. Most of the suggestions come down to changing your behavior. One thing you can do is go to bed at the same time every night. Also, studies have shown that people should avoid the bluish light from computer screens, TVs and smartphones—which our brains interpret as sunlight—for at least an hour before bed. And, by doing yoga or other relaxation techniques that put the mind at ease, subjects in studies have dramatically improved both their sleep quality and quantity.