This haze can affect teens in a negative way by affecting their ability to think, react, learn, and regulate their emotions throughout the day. One metaphor, for example, is that you don't know how poor your vision is until you try on a pair of glasses or, in this case, sleep. Some examples of sleep deprivation might be not being able to do classwork, falling asleep within five minutes of going to bed, or falling asleep right after getting home from school. A New York City high school sophomore went to the kitchen for a late-night snack at 3 in the morning. After several nights of sleeping 3 to 4 hours at a time due to working on an essay, he ended up cutting his thumb with a knife forcing him to go to the hospital and have two surgeries done on his thumb. (Garey1) Late school start times can help adolescents rebuild their quality