Actually studies at the University of Nevada Veterinary College have determined that adult dogs only sleep about 25 hours a day, which is quite a bit less than puppies.
I woke my dog up and asked her about your question.
"We can´t switch the CD to our favorite music, surf the internet, or read our favorite book. What else is there to do? Wake me up when it is time to go for a walk."
You know what she is doing now? Take a guess.