If you think it is a great idea to maximise your activity by cutting down on sleep, think again. It is not healthy to sleep fewer than seven hours, despite the fact that some well-known people claim they can make do with four or five hours. Here are some websites of interest on the topic.

Have a look at this article:

http://www.policymic.com/articles/87653/here-s-a-surprising-look-at-what-sleep-deprivation-does-to-your-body?utm_source=policymicFB&utm_medium=main&utm_campaign=social

A good talk on the subject: ttps://www.ted.com/talks/russell_foster_why_do_we_sleep#