On TikTok and Instagram, it’s showing up more and more: people showering in the dark shortly before bedtime. Just warm, running water and darkness. They claim that dark showering helps them fall asleep faster. Is that true?

Light is a powerful signal for the body. It influences our biological clock, sleep, mood, and cognitive performance. But it’s not just about how bright the light is. It also matters when and what type of light we’re exposed to.