It's important to recognize the stark contrast between men's and women's hormone cycles to understand why your experiences may vary from day to day. In men, testosterone largely governs their hormone cycle, following a diurnal pattern that peaks in the early morning and decreases throughout the day, cycling with the sun in a roughly 24-hour cycle. However, for women, their hormone cycle is regulated by four key hormones and typically spans across 28 to 32 days.