Writing is a curse. Once you start, you can't get rid of it even if you wanted to.
Yesterday I went to bed and couldn't sleep. So I wrote a short flash fiction story to submit for this Hemingway writing contest. Tried again. Couldn't sleep. So I wrote the dialogue for the scene I'll be writing today. Tried again. Nope. So I read about 100 pages. Tried again. After some tossing and turning I finally drifted off. Three hours later the alarm went off and I was up in a flash and ready to write, which I will start now.
Every time I start writing a draft, this happens. I write myself to exhaustion, get a cold from not sleeping, go through leaking snot and sneezing and coughing and losing my voice, then at one point I'd get so knocked out I sleep enough to feel better, and not until the draft is done can I break out of this pattern.