Also, if you're used to 20 minutes in the morning, 10 in the evening is fine and much easier to last.
I'll walk around the house to wake up and get some energy. Washing my face with cold water helps, too.
Better to do evening meditation earlier. If I fall asleep then that's what happens. As long as it's not habitual or frequent, I don't view it as a problem. We're all human.