I’ve been with people who were not at their best because they lacked sleep. They might try to be up so acquaintances and friends wouldn’t be offended by their lack of enthusiasm. But once they are left alone with the people they are very familiar with, a lover or a family, the sleep-deprived just shuts them off…
…because they are shutting down.
But the lover or the family knows what they are like when they are at their best. So they’d understand.
Here’s another opportunity to sleep early.