[placebo]

I doubt the fact that we know we've had a good or bad sleep is related to the existence of awareness when in deep sleep. If someone remains indefinitely in deep sleep there will be no personal experience and therefore nothing to qualify as good or bad. When a sense of self returns with waking up then your body gives you the signals from the accumulated effects that you didn't sleep in a good position or whatever positive or negative aspect that has left a trace while you were out cold.

I'm not negating the possibility that consciousness might be a primary aspect of existence - it's just that if that is the case then it is not something you have or can remember. It would be more accurate to say that it is something that has you, and as some spiritual masters would point out, it would be even more accurate not to say anything about it :)