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The average sleeping time for an adult is eight hours. There are several causes as to why a person sleeps too much -- a condition medically termed as hypersomnia or oversleeping. However, some common causes are stress, lack of self-discipline, and poor sleep in a span of a couple of days.
As a result, an insomniac (person with insomnia) will get too little and poor-quality. Insomnia can cause fatigue, daytime sleepiness, and lack of energy in performing tasks. There are several factors that can cause insomnia, and one of which is consuming too much green tea, more than 10 cups to be exact, in a day.