Why do we sleep? The answer may change right before we turn 3. – Live Science

Humans spend about a third of our lives sleeping, and scientists have long debated why slumber takes up such a huge slice of our time. Now, a new study hints that our main reason for sleeping starts off as one thing, then changes at a surprisingly specific age.
Two leading theories as to why we sleep focus on the brain
: One theory says that the brain
uses sleep to reorganize the connections between its cells, building electrical networks that support our memory
and ability to learn; the o…

Click here to view the original article.