Kotatsu use can disrupt sleep and worsen health

Sleeping in a heated kotatsu can negatively impact sleep quality, leading to difficulty falling asleep and shallower sleep. The warmth from a kotatsu can prevent the body's core temperature from dropping sufficiently for smooth sleep onset, potentially causing awakenings. Experts recommend moving to bed when feeling drowsy, ideally within an hour of bedtime, to avoid these sleep disturbances.