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| Description: In this graph, the thin horizontal red bars represent time spent in REM sleep. REM periods tend to lengthen as the night wears on, but Stage 3, which dominates during non-REM sleep early in the night, may disappear as morning approaches. Picture Stats: Views: 262 Filesize: 100.2kB Height: 354 Width: 918 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=39227 |