Optimal indoor temperature for deep sleep during winter: Romanian experts recommend 17‑20°C for nighttime and 20‑22°C during the day to ensure quality rest. Pneumologist Andreea Mihaela Popa explains that temperatures above 23°C fragment sleep and low temperatures trigger heat‑conservation mechanisms that hinder recovery. She also notes that 30‑50% humidity is ideal. The article stresses that a proper thermal environment supports circadian rhythms and melatonin production, leading to healthier sleep cycles.
Original article can be found here.