4 out of 5 will sleep all day and all night if they have a chance.

Molly on the other hand is a night owl. We have to block the hallway to keep her down in the bedroom area of the house. She feels she must patrol the house and guard us all night. Of course, guarding us means barking at all the creatures that wander the back yard at night. We live in the country and we have a LOT of creatures that wander the yard at night. She still moves around at night from one bedroom to the other, but at least she doesn't bark.