Emergency workers evacuated six people from the three-story building in Cologne after it was hit, causing the roof to collapse, the news agency dpa reported.
Following his abrupt awakening, one man was trapped in his bed by parts of the roof, but was only lightly hurt, rescuers said.
The tower and jib of the giant crane, weighing several tons, toppled during the night following its assembly on a nearby building site. An investigation was launched into the cause of the accident.
The site was cordoned off, causing major traffic snarls into Cologne from the A555 Autobahn.