Lead Sponsor

Pfizer

Age

18 - 64 years

Sex

ALL

Healthy Volunteers

Yes

•3 month history of primary insomnia;
•18 to 64 years
•For the last 3 months-regularly awake unrefreshed and unrestored
•Difficulty initiating and maintaining sleep for at least 3 nights/week for the past month (difficulty falling asleep, difficulty staying asleep, early awakening)

•Any history of an Axis 1 psychiatric diagnosis;
•History or presence of any breathing related sleep disorder;
•History or presence of any medical or neurological condition that could interfere with sleep
•Use of alcohol as a sleep aid or more than 2 standard drinks consumed per day or more than 14 consumed per week