Some things in life are necessary, like food, water and shelter. But, to be reasonably content human beings, we need a few more things. Human contact is good, alone time is great, but at the top of the list? Decent sleep. Personally, I am about 1/8 the person I'd like to be when I'm going on four hours of tossing and turning. I'm 1/8 as smart, 1/8 as capable and about 1/100 as friendly. Good sleep is absolutely mandatory.