Inadequate sleep damages your physical health: chronic sleep deprivation—short sleep and disturbed sleep—is a causal factor in 20 percent of serious car accidents,17 and in every common cause of death, including heart disease, cancer, diabetes, hypertension, Alzheimer’s, and immune dysfunction, increasing risk by up to 45 percent.18 Poor sleep is a better predictor of developing type 2 diabetes than lack of physical activity, but when was the last time anyone told you to get enough sleep to prevent diabetes?19
