This happens because your sleep cycle is out of wack. If you regularly sleep at say... 11pm, your body will normally feel tired at around 11pm. However, if you constantly sleep at random times, you body has no idea when to feel tired, until it really cannot go on.
Like Ustwo said, you're going to have to tough it out for a little while by being in bed by a certain time (even though you'll probably be wide awake for the first few days)
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This part just makes my posts easier to find
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