I suffer from insomnia. I often do not go to bed until 2 or 3 am, and then wake up at the rather ungodly hour of 5 or 6 am. This can last for days. As a result, I am exhausted most of the time, I have more frequent manic depressive episodes which are currently manifesting themselves as the dreaded "mixed" episode. Imagine having a head full of ideas of things to do, and lacking the motivation to do them. I am antsy and unmotivated all at the same time. I cry for no reason, or for reason while feeling on top of the world. It sucks.
For someone with Bipolar disorder, insomnia is a sure fire way to get yourself into an "episode." I require roughly 8 to 9 hours of solid sleep in order to remain "well." I think I have had that much sleep in the last three days. This has to stop. I will be nuts (aleady am, according to the general public) if it doesn't.
Insomnia aggravates my depression, my mania, my paranoia, and can make me psychotic (part of the Bipolar diagnosis). I do not perceive things correctly when I am this tired.
I have struggled with this all my life. Even as a child, I didn't sleep well. But I got a lot of reading done :)