Fig. 3. Examples of direct transitions from Wake to REM sleep and wake-interrupted REM sleep.
In this TG mouse, the DREM transition characteristically followed an extended episode of wakefulness, ending with a transition back to wakefulness and occurred during the dark period (ZT 23) (3a). In contrast, the REM-to-Wake transition in the WT mouse interrupted an extended bout of REM sleep and occurred during the light period (ZT 8 and ZT 10.5) (3b, c).
