My 2 yr old cat started hiding under sofa all day, normally friendly, out at night to eat. Is this normal?
It's just being a regular kitty. It's natural instincts to hide and hunt at night are kicking in.
pretty much..it may be avoiding "traffic"..
It's perfectly normal. Cats are nocturnal due to that being when they go out to hunt. As long as your cat doesn't get super unsocial, he/she is just being a cat.