Adverse drug reactions are defined as adverse events (AEs) which are in the investigator's opinion of causal relationship to the study treatment. AEs are defined as any unfavorable and unintended signs, symptoms or diseases temporally associated with the use of a medicinal product reported from the first dose of study drug to the last dose of study drug.

The safety analysis set was defined as all participants who were enrolled and completed the study.

Sleep status was determined by measuring the sleep onset latency, defined as the length of time taken from lying down for the night until sleep onset. The data was assessed at baseline, Week 4 and final visit (last visit for a participant in the study, up to Month 12).

The efficacy assessment population was defined as participants whose efficacy data at baseline and at least 1 post-baseline time points was available.

Sleep status was determined by measuring the total sleep time, defined as the amount of actual sleep time during a sleep episode. The data was assessed at baseline, Week 4 and final visit (last visit for a participant in the study, up to Month 12).

The efficacy assessment population was defined as participants whose efficacy data at baseline and at least 1 post-baseline time points was available.

Sleep status of participants was assessed and summarized by calculating the number of times participants had awaken from the time of start of the investigation. The data was assessed at baseline, Week 4 and final visit (last visit for a participant in the study, up to Month 12).

The efficacy assessment population was defined as participants whose efficacy data at baseline and at least 1 post-baseline time points was available.

Sleep onset was defined as the transition from wakefulness into sleep. PGI is a participant rated instrument to measure participant's change in overall status on a 7-point scale. Participants provide their response on a PGI questionnaire. Total score range from 1 (very much improved) to 7 (very much worse). Percentage of participants with improvement rated as "much better" or "a little better" were reported. The data was assessed at Week 4, Week 52 and final visit (follow up visit up to Month 12).

The efficacy assessment population was defined as participants whose efficacy data at baseline and at least 1 post-baseline time points was available.

Sleep duration was defined as the total amount of sleep obtained. PGI is a participant rated instrument to measure participant's change in overall status on a 7-point scale. Participants provide their response on a PGI questionnaire. Total score range from 1 (very much improved) to 7 (very much worse). Percentage of participants with improvement rated as "much better" or "a little better" were reported. The data was assessed at Week 4, Week 52 and final visit (follow up visit up to Month 12).

The efficacy assessment population was defined as participants whose efficacy data at baseline and at least 1 post-baseline time points was available.

Sleep quality was defined as participants satisfaction of the sleep experience, integrating aspects of sleep initiation, sleep maintenance, sleep quantity, and refreshment upon awakening. PGI is a participant rated instrument to measure participant's change in overall status on a 7-point scale. Participants provide their response on a PGI questionnaire. Total score range from 1 (very much improved) to 7 (very much worse). Percentage of participants with improvement rated as "much better" or "a little better" were reported. The data was assessed at Week 4, Week 52 and final visit (follow up visit up to Month 12).

The efficacy assessment population was defined as participants whose efficacy data at baseline and at least 1 post-baseline time points was available.

Morning awakening was defined as the return to the awaked state from any non-rapid eye movement (NREM) to rapid eye movement (REM) sleep stages in the morning. PGI is a participant rated instrument to measure participant's change in overall status on a 7-point scale. Participants provide their response on a PGI questionnaire. Total score range from 1 (very much improved) to 7 (very much worse). Percentage of participants with improvement rated as "much better" or "a little better" were reported. The data was assessed at Week 4, Week 52 and final visit (follow up visit up to Month 12).

The efficacy assessment population was defined as participants whose efficacy data at baseline and at least 1 post-baseline time points was available.

Remaining tiredness in the morning was defined as an experience of fatigue after complete or adequate sleep duration. PGI is a participant rated instrument to measure participant's change in overall status on a 7-point scale. Participants provide their response on a PGI questionnaire. Total score range from 1 (very much improved) to 7 (very much worse). Percentage of participants with improvement rated as "much better" or "a little better" were reported. The data was assessed at Week 4, Week 52 and final visit (follow up visit up to Month 12).

The efficacy assessment population was defined as participants whose efficacy data at baseline and at least 1 post-baseline time points was available.

Daytime somnolence was defined as excessive daytime sleepiness (EDS), characterized by general lack of energy, even after adequate or prolonged night time sleep. PGI is a participant rated instrument to measure participant's change in overall status on a 7-point scale. Participants provide their response on a PGI questionnaire. Total score range from 1 (very much improved) to 7 (very much worse). Percentage of participants with improvement rated as "much better" or "a little better" were reported. The data was assessed at Week 4, Week 52 and final visit (follow up visit up to Month 12).

The efficacy assessment population was defined as participants whose efficacy data at baseline and at least 1 post-baseline time points was available.

Daytime physical condition/function was defined as general condition of participant throughout the day after adequate or prolonged night time sleep. PGI is a participant rated instrument to measure participant's change in overall status on a 7-point scale. Participants provide their response on a PGI questionnaire. Total score range from 1 (very much improved) to 7 (very much worse). Percentage of participants with improvement rated as "much better" or "a little better" were reported. The data was assessed at Week 4, Week 52 and final visit (follow up visit up to Month 12).

The efficacy assessment population was defined as participants whose efficacy data at baseline and at least 1 post-baseline time points was available.