TEENSLEEP: Improving educational attainment through delayed school start time and sleep education

INTERVENTION: There are 3 intervention arms: 1. One arm will receive a delay in the school start day, starting at 1000 and finishing at 1600. This will be implemented in the academic year 2016/17. 2. One arm will receive sleep education, which will teach about sleep, how get good sleep and how to maintain sleep during periods of stress. Teachers will be trained in delivering this curriculum. It will be delivered over 5 weeks, 1 hour per week. This will be delivered to year 10 and 11 pupils in academic year 2015/16 and to year 10 in academic year 2016/17. 3. One arm will receive both interventions. There is also a control arm. Schools in the control arm will receive no intervention. CONDITION: Academic performance in year 10 and 11 pupils. ; Not Applicable PRIMARY OUTCOME: GCSE scores SECONDARY OUTCOME: Secondary measures will look at sleep quality, sleepiness, chronotype and general well‐being. This data will be gathered via survey comprising 4 questionnaires.; ; 1. Sleep quality will be measured using the Sleep Condition Indicator (SCI); 2. Daytime sleepiness will be measured using the Cleveland Adolescent Sleepiness Questionnaire; 3. Chronotype will be measured using the Munich Chronotype Questionnaire (MCTQ); 4. Well‐being will be measured using Kidscreen‐27; ; Ideally these will be delivered online, but paper versions will be available. These questionnaires will be administered twice in the first year of the study (once in January 2016 and again in June 2016) and 3 times in the following years in September, April and June. At the end of each academic year we will be asking schools to provide data on attendance, reason for non‐attendance, disruptive behaviour/ exclusions and number of pupils requiring additional support. ; ; The following will be collected from a sub‐sample of pupils (20 pupils from each school) via bracelet sleep monitors:; 1. Heart‐rate; 2. Temperature; 3. Sleep‐wake patterns INCLUSION CRITERIA: Secondary schools across England will be eligible to take part in the study if they agree to all of the study requirements.