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Previous studies have shown that poor sleep is associated with alcohol use, smoking, and other substance use, especially among young adults. Yet, very little is known about hallucinogen use. Methods Data from the 2011-2014 National College Health Assessment were used (N=113,749), representing a wide range of students across the US. Hallucinogen use was reported as “never,” “past,” and “present” (reflecting use in the past 30 days). Students also self-reported nights/week they did not get enough sleep to feel rested (insufficient sleep), as well as nights/week they had difficulty falling asleep (initial insomnia). Responses for both were categorized as 0, 1-2, 3-4, 5-6, or 7 nights/week. Multinomial logistic regressions examined hallucinogen use as outcome (past or present vs never) and sleep as predictor, with adjustment for covariates (age, sex, race/ethnicity, and survey year) and mental health (past 30 days depression/anxiety). Results Hallucinogen use was infrequently reported, with 4.8% (N=5,493) reporting past use and 0.98% (N=1,119) reporting present use. In adjusted analyses, increase likelihood of past use was associated with insufficient sleep on 1-2 (RRR=1.28, p=0.001), 3-4 (RRR=1.37, p&amp;lt;0.0005), 5-6 (RRR=1.30, p&amp;lt;0.0005), and 7 (RRR=1.34, p&amp;lt;0.0005) nights per week, as well as 1-2 (RRR=1.30, p&amp;lt;0.0005), 3-4 (RRR=1.52, p&amp;lt;0.0005), 5-6 (RRR=1.58, p&amp;lt;0.0005), and 7 (RRR=1.49, p&amp;lt;0.0005) nights per week of initial insomnia. Present use was associated with 1-2 (RRR=1.44, p&amp;lt;0.0005), 3-4 (RRR=1.76, p&amp;lt;0.0005), 5-6 (RRR=2.05, p&amp;lt;0.0005), and 7 (RRR=1.83, p&amp;lt;0.0005) nights per week of initial insomnia. When mental health was entered into the model, results were maintained. Conclusion Past use of hallucinogens was associated with insufficient sleep as well as insomnia. Present use was also associated with insomnia. When mental health was included in models, all results were maintained. It is not clear whether hallucinogen use leads to, or is predicted by, sleep difficulties. Support Dr. Grandner is supported by R01MD011600

0553 Hallucinogen Use Among College and University Students: Associations with Insufficient Sleep and Insomnia