Morning Light

How you start the morning affects sleep that night. This seems counterintuitive, but it’s biology.

The Circadian Rhythm

Your body runs on a 24-hour clock. This clock regulates sleep-wake cycles, hormone release, body temperature, and more.

The clock is set primarily by light. Specifically, by light hitting your eyes in the morning. This tells your body: “It’s daytime. Start the daytime processes.”

When you get adequate morning light:

• Cortisol releases at the right time (helps you wake alert)
• Body temperature follows appropriate curve
• Melatonin starts building for evening (on appropriate schedule)
• You feel awake during day, sleepy at night

When you don’t get morning light:

• The clock drifts
• Cortisol timing gets off
• Melatonin timing shifts
• You feel groggy during day, wired at night

The Practice: Morning Light Exposure

Within 30 minutes of waking, get 5-10 minutes of natural light:

Best: Go outside. Even cloudy days have more light than indoors.

Acceptable: Stand at a bright window with direct light.

Sequence: Do this BEFORE screens. The screen light is wrong spectrum and confuses the system.

This is so simple it seems trivial. It’s not. Consistent morning light is one of the most effective interventions for sleep quality and daytime energy.

Today’s Practice

Tomorrow morning:

1. Wake up
2. Within 30 minutes, get outside or to a bright window
3. Stay there 5-10 minutes
4. Before any screens

Notice how the day feels different.