A:Answer Hello Clay,
This is Dan with Dyson. The robot can cover an entire level of a home at a time. If it gets low on charge it will return to the dock, recharge and then resume cleaning. It can repeat this as many times as is necessary to clean all accessible areas, provided that the bin is emptied when full. To move to another floor, you may simply move the docking station and the robot to the next floor to start its duties.
Regarding the noise output, 74 dBa is less than what our upright models emit. Most Dyson uprights emit 86 dBa. Of course it will vary by personal preference but it may be a bit loud for sleeping conditions.
Best wishes,
Dan