Evaluation of Vestibular Stimulation to Help Occasional Sleeplessness

Inclusion Criteria

• Males and females, ages 21- 50 attempts will be made to enroll equal distributions of males and females
• Able and willing to provide written informed consent
• Self reported habitual bedtime between 2100 and 0100 hours, which does not vary by more than 1 hour at least 5 nights per week
• Self reported 7.5-9 hrs. habitual sleep time
• Able to commit to 9 hrs of sleep opportunity throughout the study, but especially for the 3 nights prior to their PSG
• Pass Berlin questionnaire, i.e. low likelihood of sleep disordered breathing
• No history or evidence of RLS(restless leg syndrome) /PLMS (periodic limb movement syndrome) /Narcolepsy, no non-respiratory related sleep disorders.

Exclusion Criteria

• Regular use of a pack or more per day of tobacco products
• Typically consumes more than 2 (12 oz) caffeinated beverages per day
• Self reported history of motion sickness
• Participation in a study of investigational or marketed drugs or devices during the 30-day period prior to the start of the study or during the study
• Clinically significant medical or psychiatric condition as determined by the investigator
• Probable diagnosis of a current sleep disorder including but not limited to insomnia, sleep apnea, restless legs syndrome, or periodic limb movement disorder
• History of current or recent (e.g. within past 5 years) alcohol, narcotic or any other drug abuse as defined by the Diagnostic and Statistical Manual of Mental Disorders of the American Psychiatric Association, 4th Edition (DSM-IV)
• Currently works night shift or rotating shift
• Travel or planned travel across more than 1 time zone within one week prior to randomization
• Use of any medication that, in the opinion of the investigator, may alter sleep or wakefulness. (See Appendix E: Guideline For Medications Commonly Associated With Alterations Of Sleep / Wake Functioning). Subjects will undergo urine drug testing.
• Consumption of more than 14 alcoholic drinks per week, or the recent consumption of more than 4 alcoholic drinks in one night. Subjects will be tested for alcohol, using a saliva test kit.
• Pregnancy (will confirm absence of pregnancy with a urine or serum pregnancy test in women's of child bearing age).
• Presence of a pacemaker
• Presence of epilepsy or other uncontrolled medical conditions.
• Prior participation in a VirtuSom protocol
• History of vestibular disorders, (such as vertigo)