How do I stop waking up tired every morning?

The most common culprits are inconsistent sleep timing and poor sleep quality rather than just sleep duration. Try going to bed and waking up at the same time every day, including weekends, since irregular schedules disrupt your circadian rhythm significantly. Avoid screens for 30-60 minutes before bed, keep your room cool and dark, and cut off caffeine by early afternoon. If you're getting 7-9 hours but still waking exhausted, consider whether you might have sleep apnea, which causes fragmented sleep you won't remember. Loud snoring, waking with headaches, or feeling unrested despite full nights are signs worth discussing with a doctor. Also check that you're not going to bed too late relative to your natural chronotype.