Hypnosis is a relaxed day dream like state where your mind will be alert and hear everything that is said to you throughout the session. It is a natural state you pass through twice a day as you go to sleep or wake up.
It varies from a comfortable light relaxation to a profoundly deep trance, almost on the verge of sleep. You are completely aware of your surroundings and in fact your sense of hearing and smell are more sensitive in hypnosis.
Each session is experienced differently as it is tailored to suit your needs at that time.