Morning Riser
Another way to identify morning wood, or an erection men may experience upon waking.
Old Lawrence woke up with a morning riser, in defiance of God's will.
Early morning riser
A person who wakes up early in the morning. The title of a Pure Prairie League song from 1972.
I think that one of the keys to my success is that I am an early morning riser. Because of this, I tend to associate mostly with other early morning risers. We drink coffee together.