Most adults need 7 to 9 hours of sleep a nightSleep Health Guidesleepguide.example, updated 2026.
Keeping the same wake-up time every day, even on weekends, helps the mostBetter Rest Studyhealth-journal.example, 2025.
Screens right before bed can make it harder to fall asleepEvening Light and Sleepscience-daily.example, 2024.