What do you mean when a girl sends a text message asking you to go to bed?

That depends on what you said before. If you ask without the first message, you may want to go down with her, that is, ask you out. And she wants to brag and chat with you without disturbing your sleep. Of course, if it is a chat, it may not have any special significance. Dude, I can see you like her, hehe! Please, if you think she is a little interested in you, you can gently tell her what you think. If she understands what you said but has no objection, then find a time to confess to her. There is a great possibility of success! Ha ha!