Sleep does much more than rest the body; it quietly reorganizes the brain. During de sleep t brain rehe the sequ of elect activity th filled t previous d. This nig replay stren the connections among the neurons that encode a fresh memory. Students who sleep after studying therefore remember more than students who stay awake for the same number of hours. Broken sleep carries a hidden cost, because the material was learned but never properly stored.

Type only the missing letters. Each box is one letter, and the number of boxes matches the letters that are missing.