From my own experience, if you don't have a good reason to get up earlier, your regime will "move out". Find yourself morning activities (for example, sign up for yoga).
The best way to get up earlier is to go to bed earlier (or at least at the same time).
Think for yourself, what's the point of sleeping so long if you get up early you can do a lot of useful things. For example, go in for sports, cook something tasty, read, etc.
Moreover, waking up at 3 o'clock, you will come to a normal state for a very long time, since daytime sleep does not provide any benefit.