MentalHealthDaily

Sleep Memory Cues Do Not Boost Parkinson’s Motor Learning

by GLOOM

Photoreal illustration of an older adult sleeping with overlay of memory and brain oscillation imagery, conveying sleep-based learning intervention.

Auditory targeted memory reactivation during a 2-hour nap did not improve motor retention in 20 Parkinson’s disease patients or 20 healthy older adults, even though the same cues changed sleep physiology by reducing spindle density and increasing slow-wave density.1 Research Highlights First Parkinson’s TMR test: Micca et al. studied 20 Parkinson’s disease patients and 20 …

Dexamethasone Disrupts Mouse Sleep Through Orexin Hyperarousal

by GLOOM

Photoreal illustration of a steroid pill bottle with overlay of disrupted sleep architecture, conveying glucocorticoid-induced insomnia mechanism.

A 2026 male-mouse study found that 30 mg/kg dexamethasone for 5 days increased light-phase wakefulness (t13 = 4.122, p = 0.0012), decreased NREM sleep (t13 = 4.412, p = 0.0007), and amplified orexin-neuron activity during NREM-to-wake transitions (F1,9 = 6.941, p = 0.0272). The result points to orexin-linked hyperarousal as a testable explanation for steroid-induced …