
Originally Posted by
Quester
We have sleep cycles, Delta wave, in stages 3 and 4 is reached in the beginning of the evening and by roughly the fifth hour we don't fall into Delta again. The following sleep cycles simply don't pass stage 2. REM and stages 1 and 2 are reached multiple times over the course of the night. It is in these stages that (for lack of a better term) cognitive maintenance occurs, like memory consolidation and learning is finalized. So, if one was an olympic power lifter, he wouldn't want to deprive himself of hours 5-8 because stages REM thru stage 2 help him to perfect is movement patterns, and other psych stuff.