Why am I so tired?

My son sleeps through the night, but wakes up "every" morning at 5:30 a.m. On the positive side, it makes my weekend days so much longer, and I'm constantly amazed at all the wonderful things I can do in a 16-plus hour day like grocery shop, cook, clean, run errands, do laundry, and oh, yes, be a mom and loving wife (re-read with sarcastic undertone). Everyone says he'll change. When? College?