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While the consequences of short sleep duration are well understood, relatively little is known about how irregular sleep durations are related to daily functioning. We utilized actigraphy and self-report methods to investigate the correlates of intraindividual sleep variability in two populations. Methods In Study 1, N=699 adults (mean age=38.04, SD=11.65; 44.78% female) completed online questionnaires on sleep, work status, and time management. In Study 2, N=100 college students (mean age=19.08, SD=1.26; 50% female; 50% underrepresented minorities) wore actiwatches for two one-week sessions (1 month apart) and reported sleep, psychosocial functions, and academic outcomes. In both studies, variability of sleep duration was defined as the individual standard deviation (ISD) of sleep durations. Results In Study 1, after controlling for mean sleep duration, greater variability in sleep duration was related to shiftwork (F=8.68, p=.003), younger age (r=-.15, p&amp;lt;.001), male gender (F=4.43, p=.036), and greater vulnerability to stress (r=.15, p=.001). Beyond mean sleep duration, variability in sleep duration also predicted poorer sleep quality (r=.25, p&amp;lt;.001), greater sleepiness during the day (r=.10, p=.014), poorer time management (r=-.09, p=.031), lower work efficiency (r=-.14, p=.002), and more procrastination (r=.11, p=.009). In Study 2, variability in actigraphy-defined sleep duration increased as the semester progressed (ISD=1.25±0.55 hours at T1; ISD=1.57±0.80 hours at T2, t=4.64, p&amp;lt;.001). After controlling for mean sleep duration, sleep variability was associated with greater perceived stress (r=.31, p=.002 at T1), poorer sleep quality (r=.39, p&amp;lt;.001 at T1; r=.30, p=.003 at T2), and lower expected grades (r=-.27, p=.01 at T2). Sleep variability was unrelated to depression or perceptions of one’s overall health. Conclusion Keeping regular sleep habits appear just as important as average sleep duration to psychosocial, work, and academic outcomes. Sleep interventions should incorporate specific guidelines on how to promote regular sleep and employers should institute work schedules that promote regularity. Support (if any) This work is supported by the National Science Foundation, Psi Chi Honor Society, and the American Psychological Association.

088 Irregular Sleep Patterns Predict Worse Sleep Quality and Poorer Psychosocial and Academic Outcomes