Day 12 of 90 · Sleep

Cool, dark, quiet bedroom

“I taped over the charger light and cracked the window. Small fixes, deeper sleep.” — Kai

Kai, Winter Arc Day 12

Today's action · 10 min

Spend ten minutes fixing your bedroom: cover or turn away glowing lights, close the curtains properly, and set the room a little cooler. Earplugs or an eye mask count too.

Why it works

The NHLBI's healthy sleep advice is simple: keep your bedroom quiet, cool and dark, with a dim night light only if you need one. These are cheap, low-effort changes to the place where your sleep habit lives.

Source: Sleep Deprivation and Deficiency: Healthy Sleep Habits (NHLBI (NIH))

Go deeperSleep Hygiene: A Science-Backed Checklist of 17 Habits That Transform Your Nights →
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Educational content, not medical advice. If you are struggling, contact a qualified professional (Lifeline 13 11 14 in Australia, 988 in the US).