What kind of experience is it to be anesthetized?

I've heard from people around me that during general anesthesia, the anesthesiologist will make the patient lie on his side, tuck his knees, and curl his head in his knees. The anesthesiologist will inject anesthetic into the spine of the patient's back, and then he will let you lie down. After a while, he will chat with the patient to see if the patient will wake up, prick his stomach with a needle and ask if he has any pain, and then he will fall asleep. After the operation, the patient will be woken up and put in a room to see if there will be any other adverse reactions. After the observation time, the patient will be pushed back to the ward.