Some people with cancer have a hard time sleeping. Some can’t fall asleep, while others can’t stay asleep. Overall, many patients just can’t get enough rest. This may be a problem you have had your whole life, or it may be new. The causes could be anxiety, depression or just not feeling well. You may have a medical condition, such as a breathing problem or side effects from medicine. If you are not sleeping well, please talk with your doctor or nurse.