Usually you can do with a few short nights, especially if you are waking up on your own.
If you have a flexible schedule, just start your day earlier. You will most likely get more sleep the next night. If you are running low for several nights in a row you might have a problem. I sleep 9+ hours on Friday and Saturday nights and get 6-7 during the week.
I don't know what that comment means, but I find it funny for what it might mean.