Some cold and sleep meds may raise the risk of cognitive impairment and delirium in seniors, a new study has found. The medications--including Benadryl, Dramamine, Excedrin PM, Nytol, Sominex, Tylenol PM and Unisom--all contain benadryl (diphenhydramine), which blocks the neurotransmitter acetylcholine. Researchers found that patients who took these OTC regularly were more likely to suffer delirium, and those who took the meds for 90 days or more tripled their risk of developing Alzheimer's....