Re: How to express "I can't sleep" "I have been suffering from insomnia" ?
I wouldn't say that "feeling like the walking dead" is more like sleepwalking at all. If I hadn't slept for a few days, I would certainly feel as if I were some kind of zombie. You might be awake but you are not capable of functioning like a normal human being. However, you are awake and mostly alert. People who sleepwalk are actually asleep.