Waking up early in the morning!

I do not know what it is but I have been waking up really early in the morning for the past few weeks. I am usually down for sleep by 8:30p.m. or 9:00p.m. at night and waking up 5:00a.m. in the morning everyday. I wonder if this pregnancy has something to do with my sleeping pattern. This pregnancy is so much different than my last one. When I was pregnant with my first daughter, I was waking up & sleeping during all kind of hours... I really did not have any routine schedule. This is so weird.I wonder if this baby is going to have a totally upset personality than my oldest one. I just can't wait to meet this baby!