A woman was airlifted to Calgary Foothills Hospital by STARS air ambulance early Saturday morning following a single vehicle crash.
RCMP were called to the scene on Highway 11, west of Sylvan Lake, near the Medicine River Bridge about 2:30 a.m.
Both the male driver and female passenger were ejected from the 1993 GMC Yukon when it rolled. The male was uninjured however the female was partially trapped under the vehicle.
She was extricated with the assistance of both Sylvan Lake and Eckville fire departments and transported by STARS in serious condition.
Investigation determined the driver had fallen asleep and lost control of the vehicle causing the collision, said RCMP Cpl. Kevin Halwa. Alcohol was not a factor.
The 31 year old male driver from Red Deer has been charged with careless driving.