I came across this topic somewhere on Word Press and wanted to respond with my own thoughts, so here goes.
Also suffering from sleepless nights I tried to analyse why, sleep is required to refresh the body and mind from the previous days living both physically and mentally.
What drives us as we wake.
Our Mind or Brain, it tells us what to do, our commitments from the previous day.
In order to perform our commitments we need our physical self.
Together we enter the day.