Sleep regression?? A phase?? Do hope so!

Is your March baby going through a sleep regression or lack of sleep phase?? I do hope it is a phase since it is driving me insane, help!! What to do? How to help him get back on his sleep schedule? Nothing has changed and we have not moved anything from his schedule and still he wakes earlier everytime (todas was 5 am), takes an hour nap and will not (for the life of me) go to sleep at 7:30 (as usual) but until 9 pm! This means he is barely sleeping 10 Hours a day! Not enough and it is driving me insane! Help!