Add insomnia to the list of health problems people with cancer must face. In a study published online in the Journal of Clinical Oncology, researchers examined questionnaires filled out by 823 cancer patients after undergoing their first two chemotherapy treatments. The findings: Thirty-seven percent suffered from sleep problems such as occasional trouble falling and staying asleep, and another 43 percent had insomnia at least three nights a week. Luckily, sleep disorders are very treatable. If you’re suffering from cancer-related insomnia, talk with your healthcare provider about the problem. You need your rest to help fight this disease.