Article continues below advertisementDonald Trump again found himself unable to keep his eyes open during business hours.The 79-year-old president was caught nodding off in his chair in the Oval Office on Wednesday, January 14, at a signing of the Whole Milk for Healthy Kids Act, where he credited milk for keeping his mind sharp. "I've taken a lot of [tests]," Trump told the room. "I've aced every one of them because I drink milk." Article continues below advertisementSource: @Microinteracti1/xDonald Trump seemingly nodded off at one point.