Anesthesia

So it turns out that for the past few OTs I've noticed a definite giddiness and somnolence that sets in while assisting a case at around 3pm. Initially I attributed it to sheer hypoglycemia from attempting to stand for about 9 hours on a cup of coffee. That got dumped after I almost fell asleep despite hearty breakfast and half a liter of milk. Then was the thought that the job of an assistant is to say the least, boring. One dribbles saline into the surgical field and occasionally clears everything up with a well directed suction tip and on rare occasions points out that the boss is actually wrong/right/or has no clue.
The answer to the sleeping beauty riddle is apparently the lack of a scavenger in the anesthesia machine. The scavenger is what keeps the sleepy gas that comes out the patient away from the atmosphere of the theater itself.
Isoflurane, I can say with great experience works like a charm...