Extreme chronotype (Morningness-Eveningness Questionnaire \>69 or \<31)
Night shift work
Ongoing participation in other research studies (as per the investigators' judgment)
Any other medical, geographic, or social factor making study participation impractical
Not English-speaking and/or inability to provide informed consent
Exclusionary for blood draws: hemoglobin \<11.6 g/dL in women / \<13.2 g/dL in men; participants with measured hemoglobin levels below these thresholds will be allowed to continue participate in study tests and procedures not involving blood draws.
