What exactly does it feel like to be put under anesthesia and how long does it take to fall asleep?

Anesthesia Feeling: Patients describe feelings of relaxation, euphoria, peace, and tranquility, also, a warm feeling running through their body. The onset of induction - falling asleep - is usually fairly rapid, like within 30 seconds to 1 minute, but does depend on the agent(s) being used. Most IV anesthetics are very well tolerated, do not cause nausea or vomiting post-operatively, and metabolize fairly quickly.

Very Few Know: With modern anesthetics we try and shut down the memory of the patient before they go to the or. Once they can't remember what happened, it is very hard to find out what they felt as they went to sleep. Without sedatives the very medication that is used to put people to sleep blocks memory formation, so we have the same problem. Same with waking up. Most patient first memory is of the pacu.