Infants spend three-quarters of their time sleeping, children about half of their time, and adults about one-third. Adolescence is a period of development during which sleep patterns often change quite radically. So, why do we spend so much time sleeping? Is it merely for the body and brain to take a rest? Recent findings confirm that, far from taking a rest, parts of the brain are more active during sleep than during wakefulness, consolidating memories of events that happene