PMP-300E (Smart Watch): Portable Monitoring Device Study

Inclusion Criteria:Inclusion Criteria: * Age 18 and over. * Require a sleep diagnostic study by physician's order. * Able and willing to provide written informed consent. * Able to speak and read English. Exclusion Criteria:Exclusion Criteria: * Participation in another interventional research study within the last 30 days. * Unstable medical or psychiatric conditions that would interfere with the demands of the study or the ability to commit to follow-up assessment. Examples include unstable congestive heart failure, neuromuscular disease, cancer, and renal failure. * Chronic respiratory failure or insufficiency with suspected or known neuromuscular disease, moderate or severe COPD or other pulmonary disorders, or any condition with an elevation of arterial carbon dioxide levels (\> 45 mmHg) while awake or participants qualifying for oxygen therapy (arterial saturation 88% for more than five minutes). * Consumption of ethanol more than 4 nights per week. (CAGE criteria) * Use of recreational drug within the past 12 months. * Women who are pregnant or currently lactating.