Sometimes I can sleep for 24 hours?

Sleeping more than 10 hours in one day is too much and can make you very weak and very tired. People who sleep too much often have a fatigue problem.

You seem to have a fatigue problem. Perhaps the energy vitamin B12 can help or a vitamin B complex. Coenzyme Q10 can also help to boost your energy level as in http://au.search.yahoo.com/search?p=%22coenzyme+q1... The super food Spirulina is another good energy booster.

One of the most common fatigue causes is anxiety, which is known to effect 40 million U.S. adults each year. Anxiety is a state of fear of real or imagined danger, which is manifested as increased heart rate, trembling, panic, weakness, extreme fatigue and stomach or intestinal discomfort. Anxiety disorders make up the largest mental illness diagnosis in the U.S.

Besides anxiety there are many other common fatigue causes such as insufficient sleep, too much sleep, under eating, thyroid problems or other illnesses (such as anemia, mononucleosis, CFS, glandular fever and many others), side effects from medication, dehydration, overexertion, an unhealthy diet and other causes as discussed in http://au.search.yahoo.com/search?p=%22common+fati...

For 24 hours?! Don't ask people on yahoo dude, see a doctor about that.