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Blue-spectrum light from phones, tablets, laptops, and LED lighting suppresses melatonin and delays sleep. For women — who already face hormonally-driven sleep challenges — minimizing evening blue light is one of the highest-impact, lowest-cost sleep improvements available. Here is what to know in 2026.
How blue light disrupts sleep
Blue wavelengths (400-500 nm) signal “daytime” to your brain. Evening exposure suppresses melatonin production and pushes back your circadian rhythm. The result: harder to fall asleep, lighter sleep, less REM.
The evidence
Studies measuring screen use within 1-2 hours of bed consistently show longer sleep onset, less REM sleep, and worse subjective sleep quality. The effect is real, though the size varies by person.
How to reduce blue light exposure
| Strategy | Effectiveness | Cost |
| No screens 1 hr before bed | Best | Free (hardest) |
| Phone out of the bedroom | Very good | Free |
| Blue-light-blocking glasses | Good | $15-$100 |
| Night Shift / warm display mode | Modest | Free |
| Warm bedside lamps only after 8pm | Good | $30-$130 |
| E-ink reader instead of tablet | Very good | $100-$300 |
What to do instead of evening scrolling
Read a physical book. Journal — especially a brain dump of tomorrow tasks. Do gentle stretching or yoga. Take a warm shower. Listen to a podcast or audiobook (audio-only avoids the light issue entirely).
Cycle and life-stage notes
During the luteal phase and perimenopause, sleep is already more fragile — protecting it from blue light matters even more those weeks. New moms doing nighttime feedings should keep phone brightness at minimum and use warm-tone night lights.
Medical disclaimer: This is not medical advice. Consult your doctor for medical concerns.