Sleeping sickness

Don't know what the heck was wrong with me but for the last 4 days or so I was incredibly sleepy all the time - so much so that whenever I would sit down to draw I'd nod off in seconds. Could not seem to get enough sleep, and had absolutely no ability to concentrate. The 1st page of Bridgman was done on the 1st day of the malady (just the left leaf), and I decided it was impossible to draw until it had passed. The 2 pages of quick figures were done during it, in moments when I had a little burst of energy. Then finally yesterday I went to bed super early and slept like Rip Van Winkle, and today I feel much better. Weird - psychosomatic? I don't think so, but I could be wrong.