The researchers noted that participants who took a microdose of LSD the day before experienced significantly increased sleep duration compared to those in the placebo group. However, no differences in sleep were observed on the actual dosing day. The differences translated to an additional 8 minutes of REM sleep, 21 minutes of overall sleep time, and 24 minutes of total sleep time on the night following microdosing. Interestingly, participants in the LSD group went to bed earlier on the night after microdosing.