Still tired after 11hrs of sleep?

hey guys my just a little worried about my friend she said she always feels tired even after having 11hrs of sleep i am getting worried and so is she, she said she went to the doctors and had tests done and all have come back clear so i dont know whats wrong :S i thought she might have been anemic but she said she... show more hey guys my just a little worried about my friend she said she always feels tired even after having 11hrs of sleep i am getting worried and so is she, she said she went to the doctors and had tests done and all have come back clear so i dont know whats wrong :S i thought she might have been anemic but she said she is only 24 and should be full of energy but i have no idea whats wrong with her and i am getting really worried about it plz help
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