Abstract Mkid 179

Objective: Sleep disruption is common in widow(er)s. The objective of this study was to characterize the sleep of Spousally Bereaved (SB) seniors (60y+) studied within 4–19 months of being widowed. Method: Subjective (PSQI, 2-weeks diary) and objective (2-weeks actigraphy) baseline sleep measures were obtained in 47 (38f, 9m) Spousally Bereaved (SB) seniors, 33 (25f, 8m) Good Sleeper Controls (GSC), and 47 (38f, 9m) Older Adults with Insomnia (OAI); each group with the same mean age (72y). OAI subjects passed formal diagnostic criteria for primary or co-morbid insomnia. GSC subjects had no diagnosis of insomnia. At baseline (pre-treatment), all subjects completed 2 weeks of detailed sleep diary and wrist actigraphy, and completed the Pittsburgh Sleep Quality Index (PSQI) among other measures. Results: Significant group effects appeared in PSQI (GSC: 2.4, SB: 6.7, OAI: 10.5; Effect Sizes [ES]>1) and diary measures. In diary measures, for Total Sleep Time, Sleep Efficiency and Wake After Sleep Onset, SB were better than OAI and worse than GSC (0.47