It is typically the result of working or active recreation, but also from boredom or disease, or simply because it is many hours ago (e.g. more than 16) that one has slept.
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... out with 18.5% under the age of 18, 4.4% from 18 to 24, 20.6% from 25 to 44, 26.3% from 45 to 64, and 30.2% who are 65 years of age or older. The median age is 49 years. ...