"Now, I need you to use these eye drops three times a day to help treat Goopy's eye infection."
"I'm not sure doc, would twice a day be ok? He has to sleep in until noon every day, otherwise he's a grumpy puppy for the rest of the day."
"Well, you could still apply the eye drops three times a day, just do it when he wakes up, sometime later in the afternoon, and again late at night before you go to bed."
"No, you don't understand, he goes back to bed at 6pm. I won't be able to give him the eye drops after that."
(Note: for all of the vets our there reading this - no, he doesn't have a medical reason for his "low" energy level. He doesn't actually have "low" energy and doesn't need to sleep that much. It's really the owner that sleeps that much, not her dog.)