An Open-label, Multicenter Study to Evaluate the Efficacy and Safety of Transitioning to Lemborexant in Japanese Subjects With Insomnia

"1. Pretreatment phase: Continue pre-registration treatment (Z-drug monotherapy) without LEM.~2. First treatment phase: Administer LEM 5 mg/day as a substitute for Z-Drug. Increasing LEM dose to 10 mg/day is allowed.~3. Maintenance phase: Succeed the treatment from the first treatment phase. Changing LEM dose is allowed. Rescue administration of Z-drug or RMT is allowed under a defined condition."

"1. Pretreatment phase: Continue pre-registration treatment (SUV monotherapy) without LEM.~2. First treatment phase: Administer LEM 5 mg/day as a substitute for SUV. Increasing to LEM dose to 10 mg/day is allowed.~3. Maintenance phase: Succeed the treatment of the first treatment phase. Changing LEM dose is allowed."

"1. Pretreatment phase: Continue pre-registration treatment (SUV and BZRA combination therapy) without LEM.~2. First treatment phase: Administer LEM 5 mg/day as a substitute for SUV and continue BZRA. Increasing to LEM dose to 10 mg/day is allowed.~3. Maintenance phase: Succeed the treatment of the first treatment phase. Changing LEM dose is allowed. Decreasing dose or discontinuation of BZRA is allowed. Rescue administration of Z-drug or RMT is allowed under a defined condition."

"1. Pretreatment phase: Continue pre-registration treatment (RMT and BZRA combination therapy) without LEM.~2. First treatment phase: Administer LEM 5 mg/day as a substitute for RMT and continue BZRA. Increasing to LEM dose to 10 mg/day is allowed.~3. Maintenance phase: Succeed the treatment of the first treatment phase. Changing LEM dose is allowed. Decreasing dose or discontinuation of BZRA is allowed. Rescue administration of Z-drug or RMT is allowed under a defined condition."