A better night for people caught between insomnia and sleep apnea

October 29, 2026 PubMed publication record · Randomized, blinded-assessment trial; 88 participants · Primary source

Insomnia and obstructive sleep apnea commonly coexist, and treating one while ignoring the other can leave patients exhausted. An 88-person randomized study tested six weekly clinician-guided online CBT-I sessions against sleep-hygiene education in people with both conditions. The results are directly relevant to Sleep Observatory readers because they measured symptoms, sleep quality and apnea physiology separately.

At three months, Insomnia Severity Index scores improved 9.5 points with guided CBT-I versus 4.0 with education, a 5.5-point difference in change. Pittsburgh Sleep Quality Index scores improved 4.9 versus 1.8 points; subjective sleepiness fell 3.4 versus 1.0. Immediately after treatment, the apnea-hypopnea index changed by −6.0 versus +2.0 events per hour. Sleepiness briefly increased in weeks two to four, although no sleepiness-related functional adverse events were reported in the study.

This is more useful than a vague claim that sleep advice helps. It identifies a defined protocol, trained guidance, a specific comparator and measured outcomes. The modest size and short follow-up still matter, and the study does not show CBT-I replaces positive airway pressure or prevents dementia. We should update the living Sleep booklet with a patient pathway for concurrent insomnia and apnea, and reserve the more speculative brain-health connections for the evidence map.

Clinical reading: Supports specialist review of guided CBT-I as an adjunct for coexisting insomnia and apnea, with apnea care maintained.