Hi everyone!

I have had my hamster hector for about 6 weeks now, and in the last few days he has suddenly decided to move out of his sleeping quarters and made himself his own nest out of bedding in the corner of the cage... this is also the corner that his water bottle is and where he pees which cant be too healthy for him can it?. Is there any way I can get him to move back in? I put some fresh bedding into the house and he just takes it out and adds it to his nest. Is there usually any reason for this sudden movement?

This is him :







Thanks