'Those who lament that life is too short would be horrified to realise that they will sleep away roughly a third of their time on the Earth, about 25 years. A newborn infant typically sleeps about 70 percent of every 24 hours and typically results in 400-750 hours lost sleep for parents in the first year (The National Sleep Research Project, 2000).
We sleep about one to 1.5 hours less than we did 100 years ago (An Intro to Sleep: What is Sleep, 2007). Anything less than five minutes to fall asleep at night means you are sleep deprived (The National Sleep Research Project, 2000). Ideally, you should take between 10 and 15 minutes to fall asleep.'
Lorelle Burton: Psychology, 3rd Ed, p. 195-196
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