My Campbells spent most of last month camping out under their wheel.
Every time I cleaned them out I dumped the new bedding in the middle of the cage and each time they dragged it under the wheel and stuffed themselves under it to sleep!! The wheel couldn't go round with all the bedding under it. Mad pair.
Now, they seem to have realised that the wheel is really good fun again and now sleep under the water bottle
Hamsters are insane.