what causes sudden tiredness
Fatigue Cause No. 1: Not Enough Sleep Fatigue Cause No. 1: Not Enough Sleep. Lack of sleep causes fatigue, and can have a negative impact on your overall health and well-being. Aim for seven to eight hours of sleep every night. Go to bed at the same time every night, and wake up at the same time each morning to keep yourself on schedule. Causes By Mayo Clinic Staff. Most of the time fatigue can be traced to one or more of your habits or routines, particularly lack of exercise. It's also commonly related to depression. On occasion, fatigue is a symptom of other underlying conditions that require medical treatment. - If youâve made efforts to address the most common lifestyle causes, such as lack of rest, poor eating habits, and stress, without success, and your fatigue has continued for two weeks or more, make an appoint with your doctor. In some cases, your fatigue might be caused by a serious medical condition. - Fatigue may be related to: 1  Use of alcohol or drugs. 2  Excess physical activity. 3  Jet lag.  Lack of physical 1  activity. Lack of sleep.  Medications, such as antihistamines, cough 1  medicines. Unhealthy eating habits.