I'm sure Jiff can give you the proper answer.........but I'm sure what your talking about is the breathing tube......put in after you go to sleep......taken out (in most cases) before you wake up.
Remember I was on a ventilator for 33 days.........it was taken out and put in 3 times during the 33 days.......trying to wean me off it. I was never awake when it was put in, but I was awake while it was in. It didn't bother me at all. The only thing I remember is touching it and my husband "freaking out" It seems a lady in ICU (while I was there) removed her vent, caused serious problems. I wasn't gonna take it out, I was just touching it