fever dreams

Do you lie awake composing prose, or is it poetry you write in the middle of the night?
If I speak of prickly flesh and fever dreams, do you know just what I mean?
Does free association make you spend lost hours still, awake?
Can you say with certainty if yesterday was a dream or reality?
And when your open eyes glimpse the morning light, can you say with certainty who you were last night?