Overview
- Social-media videos and recent reports in the UK and India amplified showering in very low light before bed as a calming wind-down.
- Studies show bright evening light suppresses melatonin and heightens alertness; typical room lighting before bed cut early-night melatonin by about 70% in a 116-person lab study, and 30 minutes under standard bathroom lighting produced similar drops.
- A 2025 crossover trial found cool white LEDs before bedtime delayed sleep onset by roughly 10 minutes compared with softer fluorescents at the same brightness.
- Warm water supports the effect: a 2019 meta-analysis reported that a bath or shower 1–2 hours before bed shortened time to fall asleep by about nine minutes and improved sleep efficiency.
- Clinicians advise dim, not total, darkness for safety and stress that the practice should complement broader sleep hygiene, with cautions for older adults, people with visual or mobility issues, and those with persistent insomnia.