Hypnotherapy usually involves the person experiencing a sense of deep relaxation with their attention narrowed down, and focused on appropriate suggestions made by the therapist.  These suggestions help people make positive changes within themselves.  In a hypnotherapy session you are always in control and you are not made to do anything. 
Contrary to popular belief, hypnosis is not a state of deep sleep.  It does involve the induction of a trance-like condition, but when in it, the patient is actually in an enhanced state of awareness, concentrating entirely on the hypnotist's voice.  In this state, the conscious mind is suppressed and the subconscious mind is revealed.
The therapist is able to suggest ideas, concepts and lifestyle adaptations to the patient, the seeds of which become firmly planted. Hypnotherapy aims to re-programme patterns of behaviour within the mind, enabling irrational fears, phobias, negative thoughts and suppressed emotions to be overcome
Hypnosis is thought to work by altering our state of consciousness in such a way that the analytical left-hand side of the brain is turned off, while the non-analytical right-hand side is made more alert.  The conscious control of the mind is inhibited, and the subconscious mind awoken.  Since the subconscious mind is a deeper-seated, more instinctive force than the conscious mind, this is the part, which has to change for the patient's behaviour and physical state to alter.

In hypnotherapy the client cannot be made to do anything they would not ordinarily do.   Most clients remain fully aware of their surroundings and situation.  The important thing is that the client must want to change some behavioural habit or addiction and is highly motivated to do so.  The readiness and ability of clients to be hypnotised varies considerably and hypnotherapy generally requires several sessions in order to achieve meaningful results.  .
Hypnosis does not involve the client being put into a deep sleep!  Sometimes when being hypnotised a client may hear every word spoken and at other times they may drift of. Hypnotherapy is not you ‘being controlled’ in any way.  It simply allows your subconscious mind the opportunity to work out what is best for you and implement positive change.

Hypnotherapy can be used for
Phobias and Fears
Anxiety and Panic Attacks
Anger and Rage
Compulsions and Obsessions
Addictions and Cravings
Weight Gain and Loss
Negative Memories
Unresolved Grief
Post Traumatic Stress Disorder
Sexual Abuse Issues
Childhood Issues
Depression and Sadness
Pain and Symptom Management
Self Image Enhancement
Peak Performance
Children - Bullying etc
Learning Blocks
Creative Blocks
Goal Setting and Achievement
These are only a few examples.