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An Alzheimer's study found that excessive daytime sleepiness may cause plaque buildup in the brain that's considered a hallmark of the condition. A leading Houston sleep doctor said this study should be a wake-up call to everyone. "This should be something you think about and one of the many reasons to not take sleep lightly," said Dr. Sudha Tallavajhula with TIRR Memorial Hermann's Neurological Sleep Medicine Center. "Having the lack of sleep, it used to be viewed as something heroic; I can function on five hours of sleep. It's not that way anymore. You have to pay that debt back some way or another."