Free Sleep Guide
Sleep Isn’t Willpower — It’s Physiology
Can’t fall asleep? Usually four switches are out of sync. Reset them in 7 days with this simple guide from a neurologist with 25 years of practice.
Light
Morning light sets your clock
Temperature
You sleep as you cool down
Caffeine
5–6h half-life
Wake time
Fix when you get up
What’s inside
1A 7-day plan — one small change a day (no pills, no gadgets)
2The science of the 4 sleep switches, in plain language
3A printable checklist to track your week
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25 yrs
Neurology Practice
100K+
Patients Treated
KHS
Headache Society Member
Prefer to grab it now? Open & print the 7-day reset →
⚠ Medical disclaimer: General health information; not a diagnosis or treatment. Persistent insomnia, loud snoring/sleep apnea, or severe daytime sleepiness need a clinician’s evaluation. © 2026 HeadacheFree · Dr. Tae Ho Guak, Neurologist.