So many things can affects your sleeping pattern, the weather, your diet, stress, your sleeping conditions, the time of the month(for girls).
once you start sleepingup to 16 18 hours a day its bad, check into the african sleeping sickness lol.
guys have a timeof the month too uve obv never met any of my mates :L jk but they do :L
if u feel verry tired and that is why u could have low iron..
all right thanks guys!