Many studies have described sleep disturbance in cancer patients and cancer surveyor for years after treatment.  Up to 80 percent of patients with cancer complain of disturbed sleep.  There may be several causes for insomnia, fatigue, and daytime sleepiness in cancer patients.  These can range from sleep apnea, abnormal leg movements, circadian rhythm disturbance (abnormalities in your sleep - wake cycles) and behavioral causes.  Medications, chemotherapy, hormonal therapy, and radiation therapy all may contribute to disturbed sleep.  I would recommend that you ask you oncologist or surgeon for a referral to our Sleep Center, so that we may address your specific issues.