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Depends which science you read, one book I was given when I was offered a membership with Mensa back when I was 14 had an interesting article on the need for sleep, I remember showing it to my parents because they always felt I didnt sleep enough :)

My son told me one day when he was 3 years old, in Scotland, it had been the first day of his life he had slept... ever

Kids say the funniest things :)

Yeah....:)