In summary, if you don’t get seven to nine hours of sleep tonight, Your frontal cortex neurons will be sluggish tomorrow, hampering your ability to pay attention and therefore to encode important new memories; You won’t as clearly and completely remember what you learned and experienced yesterday; You’ll see no improvement in your golf swing, despite yesterday’s lesson and eighteen holes; You might prematurely max out on what you can learn today; and You might be increasing your risk of developing Alzheimer’s.