Despite the common notion that stress impairs sleep there is little published data showing on home sleep polysomnography (PSG) in relation to naturally occurring stress. The purpose of the present study was to relate mean PSG across 4 home recordings to the average levels of daily stress ratings during the same weeks. No similar data are available.33 normal subjects had 4 sleeps recorded with PSG at home across 6weeks and kept a sleep/wake diary each day, including 3-hourly ratings of stress (scale 1–9). The stress ratings and the conventional PSG parameters were averaged across time. A stepwise multiple regression analysis was used to analyze the data.The results showed that the best predictors of stress were Stage 1 sleep (beta=.49), latency to Stage 1 sleep (.47) (adjusted for anxiety and age). Other sleep continuity variables (WASO) had significant correlations with stress but did not enter the stepwise multiple regression analysis. The correlation between stress before the start of the study and PSG data was not significant, but the correlation to the mean stress ratings during the 6weeks was significant (r=.50).It was concluded that moderately increased stress over a longer period of time is related to moderate signs of disturbed sleep during that period but that habitual stress ratings are not.This study was supported by the Swedish Science Council and Stockholm Stress Center.