Sleep and memory

[Added September 2006]
The last scientific result about memory and sleep :A daytime nap containing solely non-REM sleep enhances declarative but not procedural memory leads to the following reasoning. Why humans (and
animals) sleep? The obvious answer : to help our body recover is not an answer.
In fact it is enough to stay quiet without sleeping in order to recover from
stress. The evidence is mounting that the only purpose of sleep is to enhance
our memory. This explains also why childes sleep more (they have to learn a lot).

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