How can systematic desensitisation help in the cure of a phobia? i have a sleep phobia, can it be cured by this technique?

Possibly: See your doctor to arrange specialty consult for such therapies; of course, your doc should have already tried conventional therapies.

It Depends: This technique often works well for simple phobias. You need a professional to determine if it is a simple phobia or a more complex problem before that is tried. Sleep phobia is unusual and suggests you may have had a trauma. See a psychologist for an evaluation.