#221 ‒ Understanding sleep and how to improve it

Sleep serves as a foundational biological necessity, acting as a vital life-support system that evolution preserved despite its apparent vulnerability. Optimal health requires seven to nine hours of actual sleep, not just time in bed, as sleep efficiency typically hovers around 90%. Brain architecture cycles through non-REM and REM stages every 90 minutes, with deep non-REM sleep facilitating long-distance information transfer and REM sleep supporting cognitive function. Chronotypes, governed by genetics, dictate individual peak alertness times, often clashing with rigid societal schedules. While caffeine and technological stimulation can mask sleep pressure, they frequently disrupt sleep quality. Rather than relying on sedative-hypnotics, which carry significant mortality risks and impair immune function, evidence-based interventions like cognitive behavioral therapy for insomnia (CBTI) offer sustainable, non-pharmacological solutions for restoring natural sleep patterns and improving long-term health outcomes.