1. You need sleep
a. to process stored information
b. to function efficiently
c. to have energy to retrieve said stored information
d. You won't remember any of it during the test because you aren't well rested.
e. you will be more anxious and have mind blanks.
f. you will be grumpy, anxious, and in a bad mood in general
g. creates bad eating habits
h. weakens the immune system when you don't get enough sleep
i. not enough Melatonin (relaxation endorphin) is being created.
j. risk of sleeping disorders especially if you're predisposed or form a habit.