Iv`e always had a tendency to strange sleeping patterns, especially when not working. I tend to sleep till about 2 or 3 in the afternoon, then be awake all night. sometimes I seem to sleep too much, at other times too little, not being able to drop off, & ending up very tired & fed up. It`s a real pain if I have an appointment the next day & I`m exhausted from lack of sleep. Is there a way to take control of the sleep/ wake cycle?