Yes they do. Some sleep lighter than others.
Not necessarily, it depends on your husbandry. Outdoor temps are irrelevant since the temperature of your tank should be constant.
Thanks again. I never knew all this stuff. Weird it’s not mentioned more often. And that makes a lot of sense! Thanks. This is probably a stupid question but is it hard to take care of them while they’re hibernating? Do you just like leave them alone? I’d be scared I’d kill it or something. I imagine a lot of new owners probably call their vet panicked and/or accidentally bury the animal?