Nailitto Gasimoff Posted about 1 year ago Russell Foster: Why do we sleep? Telling about the importance of sleep is much easier than taking to the rule to sleep on time. Moreover, people are different. So, for instance, I could not do mental work, concentrate or sit a long time writing some, let's say, essay during the day. For me, the best time to work, read or think about smth is night. But I feel that I'm getting nervous day after day. And what I sould do? Be healthy unemployee or nervous worker?