Four people were injured and two flown to area hospitals Saturday evening after a driver fell asleep, causing a two-vehicle head-on accident in northwestern Douglas County.

Brian Dinger, 31, and Tabetha Whitt, 28, both of Lee’s Summit, Mo., were injured in the accident just west of Stull after their 2006 Chevrolet Yukon was struck by a westbound 2002 Chevrolet truck, according to a Kansas Highway Patrol report.

Division Chief Jerry Karr, of Lawrence-Douglas County Fire & Medical, said a LifeNet helicopter flew Whitt to the University of Kansas Hospital in Kansas City, Kan. A condition update was unavailable Saturday.

A LifeStar helicopter flew Dinger to Stormont-Vail Regional Health Center in Topeka. He was listed in fair condition Saturday night, a nursing supervisor said.

Eric C. Miltz, 37, Berryton, drove the truck that crossed the center line, according to the report. Miltz was taken to Lawrence Memorial Hospital by ambulance, as was 3-year-old Lex Dinger, a passenger in the Yukon.

Miltz was still being treated Saturday night, and Lex Dinger had been treated and released, a nursing supervisor said.