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Signed and dated informed consent form (ICF) from the caregiver, i.e., parent/legal guardian prior to any study mandated procedure, or as per local regulation |
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Written assent must be obtained from subjects of the appropriate age who can give assent, as determined by the caregiver and local regulation or institutional review boards (IRBs) / independent ethics committees (IECs) |
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Male or female subjects aged ≥ 10 and < 18 years at the time of signing the ICF |
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Chronic insomnia disorder in accordance with International Classification of Sleep Disorders (ICSD), 3rd edition or insomnia disorder in accordance with DSM-5 criteria at Screening, as supported by statements from the child and/or the caregiver |
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Difficulty initiating or maintaining sleep, or early morning awakening with inability to return to sleep |
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Sleep difficulty has been present for at least 3 months prior to Screening |
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Sleep difficulty occurs at least 3 nights per week |
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Persistence of sleep difficulty, despite adequate sleep hygiene or non-pharmacological therapy |
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The sleep problem occurs despite adequate age appropriate time and opportunity for sleep |
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The sleep problem is not due to the direct pharmacological effects of any concomitant medication (e.g., amphetamines, selective serotonin reuptake inhibitors) as per investigator judgment |
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Self-report or caregiver report of poor sleep quality and/or quantity impacting the daytime performance of the subject |
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Sleep Disturbance Scale for Children (SDSC) score > 16 on the Difficulty Initiating or |
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Maintaining Sleep domain at Screening |
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Adolescent of Child-Bearing Potential (AoCBP) |
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Negative serum pregnancy test at Screening and a negative urine pregnancy test at Randomization |
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Agreement to undertake urine pregnancy tests during the study, as per the schedule of activities and up to 5 days after study treatment discontinuation |
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Agreement to use an acceptable effective method of contraception from Screening up to 5 days after study treatment discontinuation |
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Inclusion criteria applicable only to a subset of children with insomnia and comorbid |
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neurodevelopmental disorder: Must have a documented history of NDD (including |
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ASD or ADHD) according to DSM-5 criteria, as confirmed by review of medical |
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records, at Screening. Use of CNS stimulants is allowed if started at least 4 |
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weeks prior to Screening, stable and expected to remain stable during the |
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study until EOT. CNS stimulants are recommended to be taken in the morning |
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Body weight < 25 kg
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Daytime napping ≥ 1 h per day on at least 3 weekdays per week during the 3 months prior to Screening
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Any lifetime history of sleep-related breathing disorders such as obstructive sleep apnea, based on the subject's medical records. Note: a subject whose breathing disorder has been treated by tonsillectomy/ adenoidectomy remains eligible
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Any other diagnosed sleep-wake disorder as defined in DSM-5 or ICSD-3 (e.g., restless legs syndrome, circadian rhythm sleep wake disorder, parasomnias, narcolepsy) at Screening
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Any of the following conditions related to suicidality
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Any suicidal ideation with intent, with or without a plan at Screening, i.e., answering "Yes" to questions 4 or 5 on the suicidal ideation section of the lifetime (Visit 1) and visit (Visit 2) version of the C-SSRS©. Participants who answer "yes" to any of these questions must be referred to the investigator for follow-up evaluation
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History of suicide attempt on the suicidal behavior section of the lifetime version of the C-SSRS© at Visit 1
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Any acute or unstable significant medical condition (e.g., seizure disorder, bipolar
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disorder, schizophrenia), hematology/biochemistry test results, ECG results
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deviating from the normal ranges to a clinically relevant extent that would
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preclude participation in the study or could prevent the subject from
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complying with study requirements, as per investigator judgement
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Cognitive behavior therapy (CBT) for any indication is allowed only if it has been started at least 1 month prior to Visit 2 and is kept stable throughout the study
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