Day 3 of 21
Day 3 — Remove caffeine as a disruptor
Caffeine can override your rhythm even if everything else is correct.
Why this matters
Caffeine blocks sleep pressure (adenosine), which is what makes you feel tired at night.
Even if you fall asleep, caffeine can reduce sleep quality and delay deeper stages.
You stabilized your rhythm with wake time and light.
Caffeine is the next factor that can quietly disrupt that system.
What to do today
Set a caffeine cutoff at least 8 hours before your planned sleep time.
- If you sleep at 23:00 → last caffeine at 15:00
- Include coffee, tea, cola, energy drinks
- Be consistent, not perfect
Rule
Keep the cutoff fixed. Do not move it based on how you feel.
Keep the cutoff fixed.
Supporting guidelines
- Earlier is better than later
- If you are sensitive, extend to 10–12 hours
- Watch hidden caffeine (tea, chocolate, soft drinks)
- Do not replace caffeine with sugar spikes
What to expect
Your energy may dip in the afternoon.
Caffeine was masking your natural energy cycle.
Your system is now recalibrating.
If energy drops, accept it — do not fix it with late caffeine.
Complete Day 3
Did you:
- set a clear caffeine cutoff?
- avoid caffeine after that time?
If yes, Day 3 is complete.
Tomorrow, you will protect your evening signal by reducing artificial light.