Sleep is essential for good mental and physical health. It helps us heal when we need healing. I went to bed very early last night, and got all the sleep I need to do well at work today. I wish to suggest to our president that he do the same.

At least eight hours of sleep a night is healthy and helpful. Also, especially for a man in his seventies who is under a great deal of stress, long naps during the day can be a literal life-saver. In Mr. Trump’s case, the number of lives saved can be very large indeed.

To free up time for sleep, I have one more piece of advice for the president: limit yourself to one tweet per day.