Why is my Hamster acting differently?

Since we moved the hamster up to my bedroom from the kitchen, she was fine the first day, but the past couple of days she seems to be more tired than normal and keeps falling asleep in her toilet and wheel. Could this be due to the fact that I let her out of her cage every evening to have a run around in my room. She seems to love exploring my room. Today, after cleaning out her cage and feeding her, she has now decided to put all of her food in to her hamster wheel instead of where she usually puts it.

I am also worried that she is not drinking enough. I filled her bottle full to the top last night, and she has only drank about a cm of it. Is this due to me moving it upstairs so that she could get out of the hole downstairs?

Cheers.

Matt