my snakes havent eaten lately(vanessa 8 days and zulu 15 days) and im wondering what would cause it.could it be because of stress? what would be some signs of stress? ive noticed my snakes dont really wanna be handled, or get very cautious whenever they're out and i walk in the room or open their cage. also, could it be because its getting cooler and humidity etc. is changing to make them think its time for them to fast for breeding season or however that works? so far they both look healthy so im not really worrying about it right now but when should i start to worry? i just really want to know why they are not eating.

sorry for all the questions its just this is the first time they've done this so im kinda stressed.

thanks guys