People with sleep apnea are more likely to fail a driving simulator test and report nodding while driving, according to new research.

The study was presented on April 12, at the Sleep and Breathing Conference in Berlin, organized by the European Respiratory Society and the European Sleep Research Society.

Sleep apnea has previously been linked with an increased chance of being involved in road traffic accidents. A research team from the University Hospital in Leeds, UK, carried out two separate studies looking at the effect sleep apnea has on driving during a simulator test, carried out at the University of Leeds.

In the first study, 133 patients with untreated sleep apnea and 89 people without the condition took part in the test. All participants completed a 90 km motorway driving simulation and were tested on a number of key criteria, including: The ability to complete the distance, time spent in the middle lane, an unprovoked crash or a