The study is a randomized controlled trial evaluating the effect of bedtime music as an early intervention for sleep-onset insomnia in adults. The investigators use a randomized controlled trial design with two parallel groups. All participants receive sleep hygiene advice as standard treatment and participants in the intervention group are additionally asked to listen to a sleep playlist daily at bedtime. Subjective and objective sleep measures are evaluated before and after the 4 weeks intervention period. In addition, follow-up measures of subjective outcomes are assessed 4 weeks after the end of the intervention period.
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Insomnia severity
Timeframe: Change from baseline to after the 4-week intervention period.