A Comparison of the Physiological and Behavioral Effects of Suvorexant and Zolpidem in Healthy Volunteers: A Randomized, Double-blind, Placebo Controlled Study

Study sessions will be randomized prior to the study (e.g. Session 1 = placebo, Session 2 = zolpidem, etc.) and volunteers will be assigned a session (treatment group) when they are scheduled for their enrollment visit (Day 1). The randomization schedule will be generated using a random number generator by a person who is not involved in data collection prior to commencement of the study, with the following qualification (hence "pseudo-random"): that all volunteers participating in the same session be randomized or "blocked" together (i.e., assigned the same condition). This will help ensure double-blinding since it may be obvious to volunteers and staff within the same session if some volunteers receive placebo whereas others receive active drug. To help maintain confidentiality, each participant will also be given a unique numerical identifier (e.g., 01-120).