Figure 1.

Description of the experimental procedure. In the evening, participants' waking state resting EEG was recorded for 8 min, after which they were asked to rate their current waking affect (AR). Participants were then allowed to fall asleep. Every time REM sleep had lasted continuously for 5 min, and was in a phasic stage, a tone signal was used to awaken the participants. Upon awakening, participants provided an oral dream report (DR) and rated their dream affect (AR). They were then allowed to continue their sleep. This procedure was repeated throughout the night until the final morning awakening. Upon final awakening in the morning, participants' waking state resting EEG was again recorded for 8 min, followed by participants' ratings of their current waking affect (AR). Two minutes of preawakening REM sleep EEG that preceded each dream report, as well as the 8 min EEG during the evening and morning wakefulness, were analyzed. FAA (F4–F3) during REM sleep and during evening wakefulness was used to predict dream affect ratings (AR).