I think there are cycles in cycles. Having lived for a while, I've seen similar cycles in my own life where each phase lasted several years, even as a yearly cycle like the OP described continued within them. The year cycle itself contains cycles that play out over a day, week, or month.

Human beings appear to be naturally cyclical beings who live in a cyclical universe. So it makes sense, and it's very healthy to realize it and plan accordingly. The phenomenon seems particularly pronounced in creative, innovative people who have some measure of control over their daily activities.