Mahmoud Ajaj, 30, of Dearborn, Mich., shot himself in the in the leg as he snoozed with a handgun he had in his hands for protection.
"He said it was for protection in case someone tried to rob them," Sgt. Gregory Blake told the Sandusky (Ohio) Register. "It appears like an accidental shooting."
The Register said Tuesday Ajaj was released from a Toledo hospital not long after the incident.
Ajaj told police he was driving on the Turnpike with his wife and two children early Monday when he decided he needed to pull over near Fremont and catch a few winks.