Over half of all cancer patients will experience some form of sleep disturbance. Stress, anxiety and depression may also contribute to sleep problems. In turn, sleep problems may exacerbate psychological distress and add to fatigue. Cancer treatments may alter the usual patterns of sleep. For example, those undergoing treatment may require daytime naps. Cancer-related fatigue may not respond to rest the way normal fatigue does, with the result that cancer survivors may always feel low energy and easily become tired.
Sleep difficulties may add to fatigue. Some employees may have difficulty waking in the morning and thus may need to start work later. Taking sleep medications can make some people feel “foggy” in the morning. Poor sleep can affect concentration, memory, energy and emotions making the demands of work more challenging.