0411 Long-term efficacy of lemborexant on objective sleep measures in clinical practice

Abstract Introduction In the treatment of insomnia, both subjective and objective evaluations are essential. The orexin receptor antagonist, lemborexant, has a favorable profile in terms of efficacy, acceptability, and tolerability for adults diagnosed with insomnia. To date, the long-term efficacy of lemborexant has been evaluated solely on a subjective basis, with no long-term objective measures under natural sleeping conditions. Therefore, a small, lightweight sleep electroencephalograph monitor was used to evaluate sleep objectively at home after 4 and 12 weeks of lemborexant treatment. Methods Adults and elderly subjects with insomnia disorder per DSM-5 were enrolled in an open-label, single-arm, single-center trial. Participants took lemborexant (5/10 mg) at bedtime for 12 weeks. In addition, they underwent a home-based sleep study at baseline and weeks 4 and 12. Sleep ­efficiency (SE), total sleep time (TST), latency to persistent sleep (LPS), and wake after sleep onset (WASO) were ­evaluated at home. Sleep disturbance (Pittsburgh sleep quality index: PSQI), ­sleepiness (Epworth sleepiness scale: ESS), and depressive symptoms (Beck depression index: BDI) were examined. Results 31 subjects completed the 4-week and 29 completed the 12-week assessments. Subjects showed significant improvements in objective SE at weeks 4 and 12 of treatment compared to untreated baseline. Objective TST tended to increase with the treatment at week 12. Mixed-effects linear analysis revealed that the poorer the sleep measures (SE, TST, LPS, and WASO) were at baseline, the more these measures improved with lemborexant. Scores of PSQI, ESS, and BDI significantly decreased (improved) with lemborexant treatment compared to those at baseline. Conclusion The findings from the analyses demonstrate objective improvement of SE with lemborexant treatment across 12 weeks and support the previously reported benefit of lemborexant using polysomnography. Support (if any)