Quick Question...

So I have 1.3 bps, 2 breedable females and a male pastel that is up to breeding weight. Up until a few weeks ago, none of them had ever missed more than one meal in a row. But, I guess since the weather has cooled down, they have gone on a hunger strike. I realize this isn't a big deal with bps, but this is the first winter I have had a male. The male and the females have been quite active the last couple weeks at night. Temps have dropped a little, but not considerably.
I guess my question is, can they smell each other? And if so, are they not eating because they are expecting/hoping to breed? I had originally planned on breeding them this winter, but I don't have the money for a hatchling rack.
Temps are around 82 during the day, down to 75 ish at night.

Can I ask why you're dropping the temps so low if you're not planning on breeding? Heck, that sounds pretty low either way

Temps are too cold. Hot side should be 92-94F and cool side should be around 82F. If you are not planning on breeding then no night drop is needed. I am breeding some snakes this season and I only drop my temps to 85F at night.

I have a little heater in my room, if I leave it on all day temps can go up to high, especially for a warm blooded person such as myself. I'll try to keep ambient temps areound 80, even if that means they will be higher.
Any idea why they would be more active if temps are to low?