Practical guide
Screen light before bed: reduce friction, not your whole life.
A realistic screen routine is often more sustainable than an all-or-nothing ban.
What matters most
Timing, brightness and what you are doing on the screen all count.
Research on light timing has found different patterns for morning and evening exposure, while public-health guidance advises turning off electronic devices before bedtime.[1][2] That does not mean every screen use has the same effect or that a filter alone solves a sleep problem.
Lower the demandMove messages, work and stimulating videos earlier if you can; keep the last part of the evening for calmer tasks.
Lower the brightnessUse the lowest comfortable setting and avoid using a bright phone in an otherwise dark room.
Change the room tooUse a small lamp for non-screen tasks so the phone is not your only source of light and attention.
A realistic experiment
Choose one repeatable change for a week.
For example, charge the phone outside the bed area, set a wind-down reminder or switch to audio for the last 20 minutes. Keep the experiment small enough that you can learn from it.
Read about blue-light glasses →References
Sources cited in this article
- Dautovich ND, Schreiber DR, Imel JL, et al. A systematic review of the amount and timing of light in association with objective and subjective sleep outcomes in community-dwelling adults. Sleep Health. 2019;5(1):31–48. doi: 10.1016/j.sleh.2018.09.006. PMID: 30670164.
- Centers for Disease Control and Prevention. About Sleep. Accessed 19 September 2026. Read the guidance.