I think sleeping sounds like a good, safe option.
I do understand why it would frustrate your wife though. My wife has physical and mental illnesses for which she sleeps a lot. Even though I know first hand what it is to be so physically and emotionally exhausted that all you can do is sleep, I sometimes feel unsupported and lonely when I wind up being alone all the time because she is sleeping. I do try hard to remind myself that she isn't choosing it, and to focus on helping her feel better so we can spend more time together. (Not making a judgement, just offering a perspective)
It sounds like maybe you have several tools for resisting, and that is great. Sleeping included. I sometimes will go for a really long walk with the dogs. That sometimes helps me.