Right now Lynn and Huggie Bear share a 55 (yes I know!!! They will be getting their own tanks turn of the new year) and you almost never see Huggie till about an hour after the lights go out. Lynn is out at any and all hours! If there is enough noise to bother her (vibrations), Lynn will come out of nowhere to check it out, but she is the one that likes to climb and roam too.
They are just like us, different.