Complete one of the cognitive sleep questionnaires (Morin, 1993; Espie, 2010), and identify whether you have any distorted beliefs about sleep. If so, try to modify a thought verbally, and see how far the level of your belief changes as a result of that. See whether you can work out a behavioural experiment to test out your distorted belief, and see how far the level of your belief changes as a result of that. What do you learn from that?