Trevor, these are probably compulsive rituals, and if the problem meets other criteria and is severe enough it's possible this client has OCD rather than a primary diagnosis of sleep disorder.  Primary insomnia is one of the simplest problems to treat with success in clinical trials of standard CBT packages around 70-80% - which is extremely high.

For an excellent summary of evidence-based practice in cognitive-behavioural hypnotherapy for sleep disorders, see the book below, online at Google books,

http://books.google.com/books?id=ovorci0UFGoC&lpg=PA333&ots=PuGysFU1Ln&dq=robin%20chapman%20hypnosis&pg=PA295#v=onepage&q=&f=false