I use a heating dome over my enclosure and have aboreal geckos, so they climb up walls and stuff to heat up. Sometimes they hide in a log so I don't see them, but I also use a gecko cave, so I can peak in on them. Most times I see them running round after the sun goes down. I still have some natural light in their room so I can just see in the enclosure, but not enough to scare then. But most times I can walk in after dark (when it's black) and they will be stuck to the front glass doors, I can turn on a small light and if I sit still enough they will stay out for me.
I also think that cos I don't see them as often as my beardies or frogs for example then it's more special when I do see them. I can also notice any changes that go on.