Start with concrete moments over which you have very little control. Fill in your class times, lunch time, and what time you need to wake up for class. What time should you go to bed? It will depend on how honest you are with yourself. Just under eight hours of sleep per night is average for most adults (“What Do We Do?” 60). It doesn't matter if you need more or less time to get a good night's sleep, but you need to go to bed at a time that allows you to feel fully awake and functional for the next time.