Overnight improvements in two REM sleep-sensitive tasks are associated with both REM and NREM sleep changes, sleep spindle features, and awakenings for dream recall

A. Differences in %N2 and %N3 sleep for participants who did not show evening-to-morning improvement on the Tower of Hanoi (ToH) time to completion. %N2 was elevated and %N3 reduced in improved participants. B. REM sleep amounts (minutes and %) for participants who did not improve on the Corsi Block Tapping (CBT) Task. CBT improved participants had more REM sleep on both measures. ∗ p < .05.