“Don’t go to bed angry”. It’s a nice sentiment. It’s also highly unrealistic.
There is a big need for forgiveness and moving on. But the timetable for that process should not be dictated by the sun. When people are angry, they go through a process. You’ve got to cool down. You need to think about things. Words and next steps need to be chosen carefully. Perspective needs to settle in. You need to “talk it out” with your partner.
Everyone works through this process in a different way, at a different pace. Don’t let it lie forever. But don’t rush it.