Insomnia therapy works from your phone, and the benefit lasts months

Cognitive behavioural therapy for insomnia is a structured treatment that tackles the habits and thoughts keeping poor sleep going, but delivering it traditionally means a trained therapist and repeated appointments. Mobile health versions promise the same programme through a phone, which could put the therapy within reach of far more people. The open questions were whether the mobile format genuinely reduces insomnia symptoms, whether any benefit outlasts the programme itself, and which design choices, such as duration, format and who delivers it, are linked to better results. This review set out to answer all three at once.

The researchers searched seven English-language and two Chinese-language databases up to July 2024, with no restriction on publication date, and also combed reference lists of relevant reviews and grey literature. They included randomised controlled trials that tested mobile health-delivered cognitive behavioural therapy for insomnia in adults with insomnia, published in either English or Chinese. Sixteen studies with 2146 participants met the criteria. Results were combined with a random-effects model, and the team ran subgroup analyses and meta-regression to identify which characteristics of the interventions were associated with better treatment outcomes.

Mobile-delivered CBT for insomnia was associated with significantly reduced insomnia symptoms and improved sleep quality straight after the intervention, and the benefit was still present at one to three months and at four to six months of follow-up. Programmes that included all five components of CBT-I, ran for six weeks or longer, and used a group format were linked to better outcomes, while differences across the other subgroup categories were not statistically significant. Studies involving participants with comorbid conditions showed a greater effect on insomnia symptoms, and programmes delivered by healthcare professionals improved sleep quality more than self-help versions did.

This pooling gathers the trial evidence on a fast-growing delivery format, and the direction of the result is consistent: benefits appeared at every time point the trials measured. The subgroup findings add practical detail that no single trial could provide, pointing to fuller programmes, longer durations, group delivery and professional involvement as the ingredients tied to bigger effects. The authors are also clear about what remains open: follow-up in the included trials stopped at six months, so the durability of the benefit beyond that point is unknown, and they call for more robust studies of long-term effects.

If insomnia is a fixture of your nights and a therapist is out of reach, this is evidence that a properly built digital programme is not a second-rate substitute: across sixteen trials, people using them reported real reductions in insomnia symptoms and better sleep quality that persisted for months. The detail is worth noting, though. The programmes tied to the best results contained the full set of CBT-I components, ran for at least six weeks and involved a healthcare professional rather than being pure self-help, which is a reason to look carefully at what any sleep app actually offers before trusting it.