Our expert says:
Many things can cause tiredness - see http://www.nlm.nih.gov/medlineplus/ency/article/003088.htm
In your case it could be that you have a slight depression, but it could also be because you don't sleep well, this impairs the brain's forming of the "feel good " hormone, Serotonin. Serotonin plays an important role as a neurotransmitter in the modulation of anger, aggression, body temperature, mood, sleep, sexuality, appetite, and metabolism of the body.
Steps to follow:
1. ensure that medically there is not a problem by going for a full check up with your GP
2. Get enough rest - sleep at least 6 hours per night
3. Eat right
4. Reduce stress levels
5. get help if you think you may have depression or anxiety
See also http://www.health24.com/dietnfood/I_want_to/15-3087,34681.asp
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