curtain lecture

a censorious lecture by a wife to her husband, often while in bed

Then came the final straw. During a particularly passionate curtain lecture, Arthur decided that he might as well use the opportunity to perform his nightly denture removal ritual. Remarkably, he's never thought to do that before. As it turned out, it might have been intuitive wisdom that had previously prevented such disastrous thoughts from making it all the way to the conscious mind.