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 happened during the day. Indeed, sleep plays a crucial role both in brain development and in learning, memory and daytime functioning. The role of sleep in the developing brains is vital. Yet the impact of sleep on cognitive a
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