Evening cravings

I've been on the program for 6 weeks now. I'm doing 14/10 as I don't need to lose any weight (165cm/51kg). Up until last week no problem whatsoever. But this last week I'm having these cravings for sweets when the fasting has started after 8pm. I eat enough, never junk food or sweet food because I don't like those. I don't understand why this is happening. Ideas anyone?