5-10-20 sunlight rule
Get 5 minutes of morning sunlight on sunny days, 10 on cloudy days, and 20 on rainy days (or by a window) to reset your circadian rhythm.
Snapshot · The Mel Robbins Podcast
9 Small Things That Will Help You Feel Amazing Again
Explore episode
Jul 27, 2026
Where this was said
Change #3: The 5-10-20 Morning Sunlight Rule
At 13:05 · chapter starts 12:40
The third change tackles a well-known but hard-to-apply piece of sleep research: getting light in your eyes first thing in the morning resets your circadian rhythm and improves sleep that night. [1] — Mel Robbins "Morning light exposure resets your circadian rhythm and directly improves your sleep that night. The 5-10-20 rule makes it stick: 5 minutes…" 12:38 The problem, Mel says, is that the moment you hear this advice, you immediately have questions — how long, what if it's cloudy, what if I can't go outside — and the complexity kills follow-through. Her solution is the 5-10-20 rule, a simple numerical anchor tied to the memory of dropping a cash envelope (filled with 5s, 10s, and 20s) into a bank's night deposit box from her waitressing days. Sunny outside? Bank 5 minutes. Cloudy? Bank 10. Raining or stuck inside? Bank 20 minutes by a window. The rule doesn't require you to understand circadian biology — it just requires you to remember three numbers and match them to the sky. The segment closes with Mel quizzing listeners to prove the trick works, modeling the 'if I can remember it, I can do it' principle from the episode's opening.
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