Sleep effect your memory

1. How does sleep effect your learning?  
Sleep effect the learning, when people sleep litter and they go to school they will fell tired one they are learning or studying.
2. How much sleep do you get each night? Do you think this is enough? Do you feel tired in the morning? 
Each night 8or9 hr i think is enough to sleep that much becouse people feel sick when they sleep a lot or when they sleep litter., in the morning when i wake up i feel tired.
3. Will you change what you do after reading about sleep and learning? Why or why not?
I am gonna do the same thing that i do everyday becouse i sleep 8hr and i feel energy in my body!!! And all human need to sleep so they could have power in thir body!!