Just watch your phases a bit:

"Several studies of PSG-measured sleep report increased SWS [25, 75], decreased REM sleep [74, 75, 160], and decreased REM density (e.g., number of eye movements during REM sleep) [74, 75]. However, this pattern is not always replicated [150]."[0]

(SWS =slow wave sleep)

[0] https://link.springer.com/article/10.1186/s13722-016-0056-7