How can I wake up naturally?

Getting into a regular sleep schedule is the best way to naturally wake up after 7-8 hours of sleep. Go to bed at the same time every night and wake up at the same time every morning, even on weekends. This may be hard at first, but you may find yourself waking up without an alarm clock eventually. Also, try to avoid taking naps. Napping can mess up the circadian rhythms set by a regular sleep schedule. They can make it harder to fall asleep at the planned time. If you do need to nap, try to keep it under 30 minutes and nap earlier in the day rather than later.