Since the Bear is at the other mammal’s house and not at home, any attacks targeting the Bear in the night will fail; however, if the person they’re sleeping with is being attacked, then they both are attacked.
If the person they are sleeping with is protected, the Bear does not share the protection.
Choosing a mammal to sleep with is an immediate ability. From that point on, they will stay with that mammal for the rest of the night. The Bear may also choose not to sleep with anybody.
The Bear may not sleep with the same mammal two nights in a row.