I need help coming up with a refute to the objection. In case you're wondering, it's for my essay in philosophy. I'm to write an argument, object to one of the premises, and then refute the objection. The problem is that I can't seem to find anything flawed or erroneous about it, so hopefully that's where you guys come in.
Someone objecting to never truly knowing if you were awake or dreaming would contend that on the contrary, you can truly know if you are awake or dreaming. The reason being that we experience pain only when we are awake, and that as much as we perceive a dream to be reality, pain will never be something that a dream is capable of bringing into reality.