Dim your evening light
Lower overall light intensity at night — the lever that actually moves your clock.
Key takeaways
- What it is: Lower overall light intensity at night — the lever that actually moves your clock.
- Why it works: Bright light in the evening delays the circadian clock and suppresses melatonin, the hormone signaling biological night. The dominant factor is total light intensity and timing, not just screen color — bright overhead lighting after dusk tells the brain it is still daytime and pushes your sleep window later.
- Evidence: Backed by randomized trials / meta-analyses.
- Avoid: Focusing on screen filters while leaving bright overhead lights blazing — the room’s overall brightness is the bigger driver.
Why it works
Bright light in the evening delays the circadian clock and suppresses melatonin, the hormone signaling biological night. The dominant factor is total light intensity and timing, not just screen color — bright overhead lighting after dusk tells the brain it is still daytime and pushes your sleep window later.
How to do it
- 1Lower overall light in the last hour or two before bed — fewer, dimmer, warmer lamps.
- 2Switch off bright overhead lights in favor of low, warm sources.
- 3Keep the bedroom dark for sleep; small light sources can still intrude.
What the evidence says
RCT / meta-analysisEvening light suppressing melatonin and delaying circadian phase is well documented, with brighter light producing larger suppression and delay.
Honest caveat: Total light intensity and timing matter more than screen "blue light" specifically; dimming the room beats only filtering a screen.
- — Gooley et al. (2011), exposure to room light before bedtime suppresses melatonin, J. Clinical Endocrinology & Metabolism
Common mistake
Focusing on screen filters while leaving bright overhead lights blazing — the room’s overall brightness is the bigger driver.
IX Coach turns evening dimming into a concrete wind-down cue and helps you change the actual light environment, not just toggle a screen setting.
Practice this with IX Coach →