Examined the possible covariations of mood and sleep in a 5-yr follow-up of 25 normal, aging women (aged 56–66 yrs) who had originally participated in the 2nd author's (1982) study. Ss slept in the laboratory for 4 nights. Wiring for EEG recording began at 10:00 PM and a mood inventory was administered at 10:30 PM on the last 3 nights. Ss went to sleep at 11:00 PM, and EEG recording was continuous from bedtime until wake-up the following morning. Results show that mood assessments were independently related to both before and after sleep night. Only 2 sleep variables, sleep efficiency and latency to 1st REM period, were reliably related to daytime moods. The relative paucity of relation between mood and sleep variables was interpreted as reflecting a general insulation of sleep from day-to-day mood variations. (16 ref) (PsycINFO Database Record (c) 2017 APA, all rights reserved)