Location = Waltham, MA
I have seen mice stockpile food supplies in wall voids & makes nests in just about everything. Quite often it happens in rodent bait stations once the rodenticide bait has been completely wiped out. In the attached picture you can see that mice completely stuffed insulation into a newly placed station.
They have nesting materials and made the station a home. Unfortunately for them the dinner is our First Strike rodenticide inside the stations which they have started consuming.
For these mice eating in bed does not make a mess, it kills you!