Exploratory Study of Circadian Relationships Between Social Behavior, Blood Pressure and Metabolomics

Inclusion Criteria: * Volunteers must be in good health as based on medical history, physical examination, vital signs, and laboratory tests as deemed by PI; * Volunteers are capable of giving informed consent; * 25-35 years of age; * Own a cell phone with internet access (smartphone with Android operating system only at this point) which installs the social sensing application ginger.io; * Non-smoking; * Male subjects only if feasible during recruitment; and * In case female volunteers are invited to enroll: non-pregnant, female subjects must consent to a urine pregnancy test. Exclusion Criteria: * Recent travel across time zones (within the past month); * Planned travel across time zones during the planned study activities; * Volunteers with irregular work hours, e.g. night shifts. * Use of illicit drugs; * Subjects, who have received an experimental drug, used an experimental medical device within 30 days prior to screening, or who gave a blood donation of ≥ one pint within 8 weeks prior to screening. * Subjects with any abnormal laboratory value or physical finding that according to the investigator may interfere with interpretation of the study results, be indicative of an underlying disease state, or compromise the safety of a potential subject.