Yes. You are right. I've seen this behavior from my wife on many occasions. Most of the time she would act angry with me in the morning if I slept on the couch. I asked her last night if she minded if I slept in our bed... her response, "I don't care," which has always meant, "Yes, please do" if I base it on her actions the following morning. I know that I need to hear what she says and realize that it is how she feels at any given time. I get that, but I can't ignore past patterns of behavior either.
As for the other night, trust me guys... I NEEDED to sleep on the couch. She was irritable enough and angry enough with me that I KNEW the couch was a better idea.