How ceiling lights delay sleep by 90 minutes nightly

Harvard study: **normal room lighting delays sleep onset** in 99% of people and cuts melatonin signals by 90 minutes nightly due to blue light exposure. **Cool white bulbs suppress sleep signals** nearly 50% more than warm bulbs at identical brightness levels, affecting circadian rhythm detection. **Nighttime light exposure increases depression risk 30%**, while daytime bright light reduces it 20%: pattern holds for anxiety and PTSD too.

Originally published by
Vibin: Anish Moonka
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