Here is the design of a clinical trial:

Official Title: SIESTA Sleep IntervEntion as Symptom Treatment for ADHD - Blended CBT Sleep Intervention to Improve Sleep, ADHD Symptoms and Related Problems in Adolescents With ADHD

Included conditions:
- ADHD
- Sleep
- Adolescents
- CBT

Study Armgroups:
- {'label': 'SIESTA training + treatment as usual for ADHD', 'type': 'EXPERIMENTAL', 'description': 'We developed a cognitive behavioral therapy for sleep problems in adolescents with ADHD. This includes seven individual sessions with the adolescent and two individual sessions with the parent(s)/guardian(s). Participants receive this CBT training called SIESTA next to their treatment as usual for ADHD symptomatology (mostly ADHD-medication).', 'interventionNames': ['Behavioral: SIESTA', 'Other: Treatment as usual for ADHD']}
- {'label': 'Treatment as usual for ADHD only', 'type': 'ACTIVE_COMPARATOR', 'description': 'Participants continue their treatment as usual for ADHD (mostly ADHD-medication).', 'interventionNames': ['Other: Treatment as usual for ADHD']}

Interventions:
- {'type': 'BEHAVIORAL', 'name': 'SIESTA', 'description': 'SIESTA is a CBT sleep training for adolescents with ADHD with a focus on sleep hygiene, motivational interviewing and planning and organization.', 'armGroupLabels': ['SIESTA training + treatment as usual for ADHD'], 'otherNames': ['Sleep IntervEntion as Symptom Treatment for ADHD']}
- {'type': 'OTHER', 'name': 'Treatment as usual for ADHD', 'description': 'Participants continue their treatment as usual for ADHD.', 'armGroupLabels': ['SIESTA training + treatment as usual for ADHD', 'Treatment as usual for ADHD only'], 'otherNames': ['TAU']}

Primary Outcomes:
- {'measure': 'Sleep architecture objective TST pre-test to post-test', 'description': 'objective (actigraphy) sleep architecture (specified as TST in hours and minutes)', 'timeFrame': 'From pre-test to post-test (+- 8 weeks)'}
- {'measure': 'Sleep architecture objective SOL pre-test to post-test', 'description': 'objective (actigraphy) sleep architecture (specified as SOL in hours and minutes)', 'timeFrame': 'From pre-test to post-test (+- 8 weeks)'}
- {'measure': 'Sleep architecture objective SE pre-test to post-test', 'description': 'objective (actigraphy) sleep architecture (specified as SE = TST/time in bed in percentage)', 'timeFrame': 'From pre-test to post-test (+- 8 weeks)'}
- {'measure': 'Sleep architecture objective NoA pre-test to post-test', 'description': 'objective (actigraphy) sleep architecture (specified as NoA)', 'timeFrame': 'From pre-test to post-test (+- 8 weeks)'}
- {'measure': 'Sleep architecture subjective TST pre-test to post-test', 'description': 'subjective (sleep logs) sleep architecture (specified as TST in hours and minutes)', 'timeFrame': 'From pre-test to post-test (+- 8 weeks)'}
- {'measure': 'Sleep architecture subjective SOL pre-test to post-test', 'description': 'subjective (sleep logs) sleep architecture (specified as SOL in hours and minutes)', 'timeFrame': 'From pre-test to post-test (+- 8 weeks)'}
- {'measure': 'Sleep architecture subjective SE pre-test to post-test', 'description': 'subjective (sleep logs) sleep architecture (specified as SE = TST/time in bed in percentage)', 'timeFrame': 'From pre-test to post-test (+- 8 weeks)'}
- {'measure': 'Sleep architecture subjective NoA pre-test to post-test', 'description': 'subjective (sleep logs) sleep architecture (specified as NoA)', 'timeFrame': 'From pre-test to post-test (+- 8 weeks)'}
- {'measure': 'Sleep architecture objective TST pre-test to follow-up', 'description': 'objective (actigraphy) sleep architecture (specified as TST in hours and minutes)', 'timeFrame': 'From pre-test to follow-up (+-3 months after posttest)'}
- {'measure': 'Sleep architecture objective SOL pre-test to follow-up', 'description': 'objective (actigraphy) sleep architecture (specified as SOL in hours and minutes)', 'timeFrame': 'From pre-test to follow-up (+-3 months after posttest)'}
- {'measure': 'Sleep architecture objective SE pre-test to follow-up', 'description': 'objective (actigraphy) sleep architecture (specified as SE = TST/time in bed in percentage)', 'timeFrame': 'From pre-test to follow-up (+-3 months after posttest)'}
- {'measure': 'Sleep architecture objective NoA pre-test to follow-up', 'description': 'objective (actigraphy) sleep architecture (specified as NoA)', 'timeFrame': 'From pre-test to follow-up (+-3 months after posttest)'}
- {'measure': 'Sleep architecture subjective TST pre-test to follow-up', 'description': 'subjective (sleep logs) sleep architecture (specified as TST in hours and minutes)', 'timeFrame': 'From pre-test to follow-up (+-3 months after posttest)'}
- {'measure': 'Sleep architecture subjective SOL pre-test to follow-up', 'description': 'subjective (sleep logs) sleep architecture (specified as SOL in hours and minutes)', 'timeFrame': 'From pre-test to follow-up (+-3 months after posttest)'}
- {'measure': 'Sleep architecture subjective SE pre-test to follow-up', 'description': 'subjective (sleep logs) sleep architecture (specified as SE = TST/time in bed in percentage)', 'timeFrame': 'From pre-test to follow-up (+-3 months after posttest)'}
- {'measure': 'Sleep architecture subjective NoA pre-test to follow-up', 'description': 'subjective (sleep logs) sleep architecture (specified as NoA)', 'timeFrame': 'From pre-test to follow-up (+-3 months after posttest)'}
- {'measure': 'Sleep problems SSHS pre-test to post-test', 'description': 'subjective sleep problems assessed by questionnaires (SSHS)', 'timeFrame': 'From pre-test to post-test (+- 8 weeks)'}
- {'measure': 'Sleep problems CSRQ pre-test to post-test', 'description': 'subjective sleep problems assessed by questionnaires (CSRQ)', 'timeFrame': 'From pre-test to post-test (+- 8 weeks)'}
- {'measure': 'Sleep problems CSHQ pre-test to post-test', 'description': 'subjective sleep problems assessed by questionnaires (CSHQ)', 'timeFrame': 'From pre-test to post-test (+- 8 weeks)'}
- {'measure': 'Sleep problems SSHS pre-test to follow-up', 'description': 'subjective sleep problems assessed by questionnaires (SSHS)', 'timeFrame': 'From pre-test to follow-up (+-3 months after posttest)'}
- {'measure': 'Sleep problems CSRQ pre-test to follow-up', 'description': 'subjective sleep problems assessed by questionnaires (CSRQ)', 'timeFrame': 'From pre-test to follow-up (+-3 months after posttest)'}
- {'measure': 'Sleep problems CSHQ pre-test to follow-up', 'description': 'subjective sleep problems assessed by questionnaires (CSHQ)', 'timeFrame': 'From pre-test to follow-up (+-3 months after posttest)'}
- {'measure': 'Sleep hygiene pre-test to post-test', 'description': 'subjective sleep hygiene assessed by questionnaires (ASHSr)', 'timeFrame': 'From pre-test to post-test (+- 8 weeks)'}
- {'measure': 'Sleep hygiene pre-test to follow-up', 'description': 'subjective sleep hygiene assessed by questionnaires (ASHSr)', 'timeFrame': 'From pre-test to follow-up (+-3 months after posttest)'}

Please estimate the sample size based on the assumption: 
A power of 0.8 and an Î± of 0.5 were used. An additional 15% was added to account for possible drop-out or lack of response on assessment.
Sample size estimates
        A recent study in typically developing adolescents with sleep problems found large effects (Î²=0.91) at post-test of a CBT sleep treatment as compared with waitlist controls on their primary sleep-related outcome measure (objectively measured) and a medium effect size for reduction of ADHD symptoms.13 14 Based on this research, moderate to large effect sizes can be expected for SIESTA in combination with TAU for ADHD on sleep outcomes as compared with TAU for ADHD only. Therefore, using G*power we calculated with this large effect size a power of 0.8 and an Î± of 0.5 for our desired sample size. There are at least 40 participants per condition needed for analysing the data implementing a linear mixed effects model. However, to anticipate for possible drop-out or lack of response on assessment (although expected to be minimal due to inclusion of motivational interviewing and the pilot study) and as the effect size of the ADHD outcome is medium and not large (d=0.55), an additional 15% will be recruited, resulting in a total of 92 participants, with 46 participants per condition.