In-depth operational protocols for resetting your central pacemaker, managing night shifts, timing caffeine clearance, and structuring your life around your biology.
Fix your sleep schedule in 14 days: a fixed wake time, 20 minutes of morning light, earlier meals, dim evenings and a caffeine cutoff set by dose.
How to protect daytime sleep on night shifts: the commute home, anchor sleep, meal and caffeine timing, and how to rotate back to days on your off-shift.
Caffeine's half-life runs roughly 4 to 7 hours. Work out your own cutoff from dose, metabolism and bedtime, so less than 50 mg is left when you go to sleep.
About 20 minutes outside, within an hour of waking. Why indoor light falls short, how weather changes the dose, and what to do on dark winter mornings.
Sample daily schedules for Dr. Michael Breus's four chronotypes (Lion, Bear, Wolf and Dolphin): peak focus hours, coffee timing, the afternoon dip and bedtime.
What social jetlag is, how to calculate yours from your sleep midpoint, and how to plan weekends and Sunday nights so Monday doesn't feel like a long flight.
Why ADHD and late sleep so often go together, plus practical steps for mornings and evenings, and the medication-timing questions to raise with your prescriber.
Why flying east is harder than flying west, and how to use light, meal timing and (with your doctor's OK) low-dose melatonin to adjust to a new time zone faster.
How evening screens and LED lighting delay melatonin, why dimming matters more than filters, and a simple 60-minute wind-down to protect your sleep.
How the daily body temperature rhythm gates sleep, how to estimate your Tmin, and how warm-bath timing and a cool bedroom help you fall asleep faster.
What adenosine is, how sleep pressure builds from the moment you wake, why caffeine only masks it, and a 4-step plan for the afternoon dip without more coffee.
How the cortisol awakening response works and a 7-day morning routine (light, water, movement, later coffee) to wake up clearer without extra caffeine.
Why you feel groggy after waking, why waking from deep sleep makes it worse, and a 10-minute routine of light, cold water and movement to clear it faster.
Circadian intermittent fasting explained: why meal timing matters to your body clock, what time-restricted eating trials found, and how to try it safely.
What Non-Sleep Deep Rest (NSDR) is, what the research does and doesn't show, and a 20-minute script to rest deeply at your dip without post-nap grogginess.
Different bedtimes in your relationship? Find your chronotype overlap window, set up the bedroom so you don't wake each other, and make split sleep feel normal.
The best time to work out for your chronotype: when strength peaks, whether training time changes muscle gain, and how late workouts really affect sleep.
How dark winter mornings shift your body clock, how light boxes and dawn simulators are used, and when to talk to a doctor about seasonal depression.
What deep (slow-wave) sleep does, why it front-loads into the first half of the night, and the habits that protect it, from caffeine timing to room heat.
Get about 20 minutes of outdoor light every morning for 7 days. A day-by-day challenge with a simple tracker, what to expect, and how to keep it going.
Test one change for five days, such as a walk before the dip or an earlier coffee cutoff, and compare it with your usual week to see what fixes your crash.
Explore our 10+ free circadian calculators to compute your exact caffeine cutoff, outdoor sunlight duration, and social jetlag score.