The principal objective of the study is to assess the feasibility and preliminary efficacy of an online-delivered CBT-I intervention for those with insomnia or reporting sleep difficulties. The program will be offered to service users of IAPT to establish criteria for the planning of a future large scale RCT study.
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Changes in insomnia severity (as measured by the Insomnia Severity Index, ISI)
Timeframe: Baseline - Immediately after the intervention
Changes in average sleep efficiency (i.e. total time spent asleep divided by the total time spent in bed in a given day)
Timeframe: Baseline - Immediately after the intervention