Dr. Michael Breus: Why your chronotype runs your sleep

Breus frames sleep as a combination of adenosine-driven sleepiness (sleep drive) and circadian timing (sleep rhythm). Many problems come from fixing the wrong system—e.g., using melatonin to “knock yourself out,” when it’s mainly a timing signal.

Drink black coffee quickly, then nap ~25 minutes so adenosine clears while caffeine is still absorbing; caffeine then blocks new adenosine binding. He claims this can provide ~4 hours of improved alertness, especially after short sleep.

He recommends 15–20 oz (roughly 3–4 cups) of water on waking and avoiding caffeine for the first 90 minutes. The rationale: cortisol/adrenaline are already high on waking; waiting makes caffeine more effective and reduces dehydration/diuretic effects.

Breus argues late-night sex is mismatched with typical hormone profiles (melatonin high; sex-supportive hormones lower). Morning sex aligns better with testosterone/cortisol/adrenaline being higher and melatonin low, and surveys suggest improved connection/performance.

He attributes this window partly to normal core temperature cycling and says most people return to sleep quickly unless they spike arousal. Standing up raises heart rate (making sleep harder), and checking the clock triggers anxiety and mental “sleep math.”