I think I've had the mega alert / major tiredness thing with it before (I'm sure I've used a sleeping + caffeine pill analogy to describe it to someone at some point) but this is just knocking me down. It's crossed my mind that I've caught the flu on top of it or something, but I doubt it because I was vaccinated a few weeks ago.

I tried listening to an audio book for a bit but I wasn't taking any of it in I was so sleepy. I must have drifted off for ten minutes and woke up with a start, very confused. I haven't been able to get more than 3 hours of sleep per night. It's like auto-pilot, you're right.