Why do people sleep? What are the functions of sleep and dreaming? How do humans benefit from spending a third of their lives in an unconscious brain state?

Sleep is vital to every mammal, bird, reptile, amphibian and fish on the planet. While bats spend 20 hours a day in the land of nod, humans require 8 hours and giraffes need only 2 hours of sleep! This observation has led to some evolutionary theories of sleep.

• Book Developmental Psychology Review

  Bp Developmental Psychology An Advanced Textbook By Marc H Bornstein Michael E Lamb - Scholarly books, journals and articles Bp Developmental Psychology An Advanced ...

• American Psycho Ending Explanation

• Applied Psychology Textbook

• Publication Manual Of The American Psychological Assocation

• Beverly Gay Green Issue Lesbian Psychology

  Psychological Perspectives on Lesbian and Gay Issues. Edited by Gregory M. Herek and Beverly Greene. Sage Publications.