Sleep spindle density increases in patients with severe obstructive sleep apnea after 6 months of treatment: a longitudinal study

Description

Ainhoa Álvarez-Ruiz-Larrinaga and colleagues asked whether six months of sleep apnea care could restore the brief bursts of brain activity that help keep sleep steady. Published in 2026, the study tracked 216 patients with suspected apnea, measuring these bursts, called sleep spindles, across four scalp sites before and after routine treatment. Patients ranged from no or mild apnea to severe apnea, judged by breathing pauses per hour.

At the start, severe apnea patients showed clearly fewer spindles than the milder groups. After six months, spindle density rose markedly, but only in the severe group, with the gain holding across central and some frontal sites. Closer checks tied the firm gain to fast spindles at one central site. The findings suggest spindle counts can mark how deeply apnea has disturbed sleep structure and whether treatment is repairing it.

Catalog record

Source: https://europepmc.org/articles/PMC13518951