I've been wondering about a way to publish this experience, and this appears the perfect spot.
Dialysis patients notoriously have trouble sleeping, so for a while I was trying various sleeping pills. (I have since given up on all of them.) I had Ambien for a while, the weakest dose. In my particular form of insomnia, I'd go to sleep between 10 and 11 and wake up -- wide awake -- an hour later. Usually I'd kill time going out to an all-night donut shop, listening to John Batchelor in my car, smoking a cigar, till I could relax and go to sleep again.
And I had become very familiar with how fast sleeping pills worked -- I thought.
So there I am one night about 1:30, having switched over by that time to the Beeb, and I've eaten my donut and drunk about a quarter of my coffee and lit my cigar. I pull out my Ambien bottle, take one, figure to start for home in 10 minutes.
But in ten minutes, just like a switch had been thrown, my vision doubles. I was seeing literally two of everything.
Thinks I, "I better get home."