He hasn’t contacted me for a day, and he hasn’t sent me a message. I plan to go to bed early and won’t say good night to him.

If there is no contact for a day, it doesn’t matter if I don’t send you a single message, so don’t worry about it.

Maybe he worked for a day, so he was busy, and then he was very tired after get off work, or he went out with his friends, drank, etc., to relax. When I'm in a bad mood, I don't have time to talk to you. This is human nature.

Also, he himself is very introverted, so he doesn’t like chatting with others, because he doesn’t know what to express, and he doesn’t know what topics to talk about, so he won’t talk to you. There is nothing unusual about talking.

If you don’t want to send a message, don’t send a message. This is not a big deal, it’s just a small thing. Then you can just go to bed early, and there is no need to say good night or anything like that. After all, there aren’t that many topics to talk about every day.