Fatigue refers to a lack of energy, rather than a desire to sleep. You can be fatigued or sleepy or both. You could be neither. If you are neither, why are you reading this book? What you really need is a book to help you understand why everyone hates you and your fresh and energetic life. True sleepiness is caused by one of three things: medication, sleep deprivation, or sleep dysfunction. Our sleep is based on two systems, the homeostatic and circadian. You are or you are not sleepy. If you were brave enough to take some sleepiness assessments, you should have a feel for how sleepy you are
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