What's my locker number? I'm almost late for class and I'm not sure of my schedule. Do I need my math book or my science book?

This is a recurring dream, not frequent but always about the same. Many times I stand there looking for the right locker and I realize I'm at school in my pajamas.

I'm frustrated at this stage but usually come through with the right solution before I awake. I wonder if this comes at a time when I don't feel prepared for some upcoming task.