#135 - Two Windows: How Light Shapes your Sleep

About this episode

Matt discusses how daily light exposure influences sleep quality and the effects of artificial lighting on our biology.

Matt delves into how daily light exposure dictates our sleep quality and how improper lighting can derail perfect sleep hygiene. He explains that our brain's internal clock naturally drifts backward by 14 minutes daily, requiring a corrective signal like outdoor sunlight before 10:00 a.m. to act as a crucial biological anchor for timing the eventual release of sleep-regulating hormones like melatonin. Moving to the evening, Matt unpacks how artificial lighting combats our biology by s...

People in this episode

Host: Dr. Matt Walker

Topics covered

• light exposure
• sleep quality
• sleep hygiene
• biological clock
• artificial lighting

Keywords

• sleep
• light exposure
• melatonin
• biological clock
• sleep hygiene
• artificial lighting

More episodes of The Matt Walker Podcast

• #139 - Waking Up · June 8, 2026 · 29 min
• #138 - The Sleepy Girl Mocktail · June 1, 2026 · 31 min
• #137 - Bedtime Procrastination · May 27, 2026 · 30 min
• #136 - Sleep & Sound · May 20, 2026 · 33 min
• #134 - Seeing Inside the Brain with Prenuvo · May 4, 2026 · 1h 8m
• #133 - Sleep & Doomscrolling · April 27, 2026 · 33 min