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Having trouble falling asleep? It could be because you’re getting older.A researcher at the University of Kent discovered that aging can impair a person’s circadian clock, which helps determine sleep habits in mammals. A receptor in the brain used to transmit light information becomes less efficient with age, which can lead to disrupted sleep.Sleep deprivation can lead to many health problems, including weight gain, high blood pressure and heart disease. About 40 percent of Americans get less than the recommended seven to nine hours of sleep per night.