Participant timeline {13}
BLOOD
The schedule of time points, study assessments, and interventions is listed in Fig. Schedule of time points, study assessments, and interventionsAfter web or telephone screening, participants will complete a baseline/screening visit. Participants will undergo standardized BP screening to determine BP eligibility. The BP screening protocol involves 3 unattended BP recordings taken with an automated BP machine (HEM-907HL, OMRON Healthcare Inc.) after a 5-m quiet resting period and 3 m between measurements. If they meet the study criteria, they will review the consent form with the study staff and complete the informed consent prior to continuing the study visit. Participants will complete self-reported questionnaires and cognitive testing and then will wear the study devices at home over the next 10 days (Apnea link monitor for 1 night, ambulatory blood pressure monitor (OnTrak Ambulatory Blood Pressure Monitor 90,227, Spacelabs Inc.) for 24 h, and actigraphy and physical activity monitor for 10 nights). At the end of the baseline period, participants will return to the lab to download their devices and will have their blood drawn. If eligible for the study, they will be randomized to either the sleep extension intervention group or the education control group. They will receive a study letter and materials in the mail, as well as a call from the study coach informing them of their group assignment. The study interventions have 3 main periods. In the intervention period (study weeks 1–8), participants will receive 8-weekly intervention or control sessions and content. In the maintenance period (months 2–6), participants will receive monthly intervention or control sessions and materials. Finally, in months 6–12, participants will be observed, but there will be no interventions delivered.