Sleep Extension and Blood Pressure

Inclusion Criteria: * Age: 18 to 65 (inclusive) * Gender: both males and females * Body mass index (BMI): 18.5-34.9 kg/m2 * Habitual sleep duration: \<7 hours * Presence of either: * Prehypertension: office systolic BP (SBP) 120-139 mmHg and/or diastolic BP (DBP) 80- 89 mmHg; * Stage 1 hypertension: office SBP 140-159 mmHg and/or DBP 90-99 mmHg * Either on no prescription medications (other than oral contraceptive pills, or intrauterine devices) or on stable medical regimen for at least 1 month, if taking prescription medications for chronic conditions * Not pregnant or breast feeding and not intending to become pregnant or breast feed * Not a current smoker or tobacco user * Ability to provide written informed consent Exclusion Criteria: * Vulnerable study populations will be excluded * Pregnancy * Smoking * Presence of overt cardiovascular diseases, diabetes, chronic kidney disease, cancer, sleep disorders, psychiatric disorders * If taking prescription medications for chronic conditions, change in therapy (type, frequency and/or dosage) over the previous month * Habitual sleep duration ≥7 hours * Excessive alcohol (≥15 drinks/week in men and ≥8 drinks/week in women) and/or excessive caffeine intake (\>400 mg) * Currently on a diet and/or actively trying to lose weight * Currently or previously (during the past 2 months) participation in any other research study at the discretion of study personnel * Blood/plasma donation during the past 2 months * Unwillingness or inability to adjust sleep schedule.