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Chronotypes Explain Sleep Timing
- Chronotypes are genetically determined variations in morning/evening preference driven by clock genes like PER3.
- Knowing your chronotype predicts hormone timing and explains mismatched schedules between partners.
Hormone Window Determines Sexual Arousal
- Successful sex requires five hormones high (estrogen, progesterone, testosterone, cortisol, adrenaline) and melatonin low.
- Most evening sex windows (10:30–11:30pm) have the opposite hormone profile, lowering arousal.
Schedule Sex By Chronotype
- If partners have mismatched chronotypes, plan sex around each person's hormone peaks (e.g., morning for many men).
- Use chronotype-based scheduling (matrix) to negotiate timing rather than blame.