No one here has ever figured out what those cycles are.
Lots of hypothesis:
1. Aligned with college semester or quarter starts or ending?
2. Holidays?
3. Springtime/summer/autumn, or winter move-ins from her old city to yours?
4. Shorter view: last 10 days of the month and rent will be due soon?
5. After or before Valentines Day when chicks are likely to get dumped by their a-hole BF?
6. Higher or lower unemployment trends?
7. Post-summer or post-Spring Break vacation times when she needs to pay off all those travel bills?
8. Right after the corporate end-of-year bonus season, they can smell the cash in our wallets like a shark smells blood in the water?
9. Flood of new, viral favorable or unfavorable social media blogs about sugaring?
10. Maybe it's just sunspots?
Pick one, or make up your own, you might be right... but I doubt it. :p
Life is good
The Cat