A 5-year-old boy riding in a car suffered injuries when his father hit a sign in Covina on Monday.

“We believe (the driver) fell asleep,” Covina police Lt. Trevor Gaumer said.

The solo crash happened near the corner of Second Avenue and School Street around 7:30 a.m.

Gaumer said a car southbound on Second drifted and hit the concrete base of a sign at the H.H. Dorje Chang Buddha III Cultural and Art Museum, 170 E. School St.

He said the driver, a 27-year-old Covina man, wasn’t injured. A helicopter transported the driver’s son to a hospital.