Tibit: Memory

Many researchers believes that sleep plays an active role in consolidation of declarative memory. Specifically, sleep’s unique properties enhance memory consolidation, such as the reactivation of newly learned memories during sleep.
Slow-Wave Sleep, often referred to as deep sleep, plays the most important role in consolidation of declarative memory and there is a large amount of evidence to support this claim. For instance, one study found that the first 3.5 hours of sleep offer the greatest performance enhancement on memory recall tasks, because the first couple of hours are dominated by SWS.