The man is formally suspected of violating Norway's maritime law.
I can confirm that the police initially received information from others on board that he had fallen asleep, says Kjetil Bruland Sørensen at the Trøndelag police district to Norwegian NTB.
The homeowners in Byneset outside Trondheim got a surprising start to Thursday when a neighbor knocked on – and asked if they had noticed the large boat outside.
A 135-meter-long container ship had then run aground in Trondheimsfjorden and stopped just meters from the family's door.
There are no signs of technical failure on the ship, according to the police, and the man is not suspected of having been ill during the incident.
No one was injured in connection with the grounding.