A new study from the University of Rochester in the United States says restoring the body’s sleep-wake cycle may improve brain recovery after a stroke, even days later. The work, published in the Journal of Clinical Investigation, explores whether circadian interventions can aid rehabilitation by boosting the brain’s waste-clearance system and reducing inflammation.
Researchers focused on the glymphatic system, a cleanup mechanism that works mainly during sleep and is significantly disrupted after stroke. In healthy mice, they tested several ways to strengthen circadian rhythms, including controlled light exposure, melatonin, restricted eating times, and a drug called KL001. All of the approaches improved glymphatic activity.
They then applied the two most effective interventions, time-restricted feeding and KL001, to mice that had suffered a stroke. Treatment began three days after the event, which is relatively late compared with current therapies. Even so, the treated mice showed better motor function, smaller brain damage, stronger glymphatic activity, and lower levels of inflammatory molecules in the brain.
The researchers said the implications could be broad because most stroke treatments must be given within hours to work. Rhythm-based interventions, by contrast, could widen the treatment window and make it possible to help patients days after a stroke. They stressed, however, that the findings are still preclinical and human trials are needed before any clinical recommendation. If confirmed, simple routines such as regular sleep, timed light exposure, and fixed meal hours could become part of stroke recovery. The team wrote that restoring a normal daily rhythm after stroke can significantly improve neurological recovery, even when started days later.
