I have a few issues with what he said, but to focus specifically on the thread title of ‘Go to bed angry’ I would strongly disagree.

Whether in a marriage or not, endeavour to never let anger take more than the minimum amount of your time possible. This is most readily achieved by observing the anger, and witnessing how quickly if fades to nothing when you are not feeding it.

It takes some practice, though not much, and an acceptance of personal responsibility, but allowing for that one should never go to bed angry.