Some persons with CFS/ME have a "crash," or a period of immobilizing physical and/or mental tiredness. This frequently occurs when a person is "overloaded," either physically, intellectually, or emotionally. Some CFS patients have virus-like symptoms. They are "unwell," have a fever, a sore throat, and enlarged lymph nodes. These patients need to be seen by a doctor. Other CFS patients do not experience any "crashes." They may seem perfectly normal during the day, but when bedtime comes they are exhausted and need to sleep. Some of these people can work at night and use the morning to recuperate before starting their jobs. But most need to be supported in staying awake for long periods. A few CFS patients experience many more "crashes" than others. They may need help from other people all the time to get through the day's activities.