Forty versus twenty minutes trials maintenance of wakefulness test regimen for driving licensing. Limor Arzi MD, Roni Shreter MD, Baruch El-Ad MD, Ron Peled MD, Giora Pillar MD, PhD The Sleep Laboratory, Rambam Medical Center and Faculty of Medicine, Technion, Haifa 31096, ISRAEL. Correspondence: Giora Pillar, MD, PhD Sleep Laboratory Rambam Medical Center, Haifa 31096 Tel: 972-4-8538585 Fax: 972-4-8542441 E-mail gpillar@tx.technion.ac.il Running head: MWT40 vs MWT20 for driving licensing