The primary objective of this study is to determine whether treatment with Armodafinil (CEP-10953) is more effective than placebo treatment for patients with excessive sleepiness associated with obstructive sleep apnea/hypopnea syndrome (OSAHS) by measuring mean sleep latency from the Maintenance of Wakefulness Test (MWT) (30-minute version) (average of 4 naps at 0900, 1100, 1300, and 1500) and by Clinical Global Impression of Change (CGI-C) ratings (as related to general condition) at week 12, or last post-baseline visit.