My ex used to wake me up for work everyday and on a lot of occasions in our long relation I woke up realizing she is doing something down there and I am all erect. I am sure she tried her best on some of those occasions not to wake me up but I guess by the time she started sucking me I was up.
It sure is great fun, I remember having some nice sex with her. She loved morning sex and I used to get late for work