No. You might think so, but that's only because you're not thinking well when you're sleep deprived. "Multiple studies have shown that people don’t functionally adapt to less sleep than their bodies need."
Extended vacations are the best times to assess how much sleep you truly need. Once you catch up on lost sleep and are not sleep deprived, the amount you end up sleeping is a good measure how much you need every night. You can ask yourself the questions, “Do you feel that your brain is much sharper, your temper is better, you’re paying attention more effectively? If those answers are yes, than definitely get the sleep,” said Dr. Veasey, who realized -- to her chagrin -- that she needs nine hours of sleep a night to function effectively.Unaddressed subject: Are you oversleeping because you believe you should get at least 7 or 8 hours? If, on that "extended vacation," you're up after 6 or 5 hours, can you credit yourself with only needing that much? What if it's only 4 (as it is, we're told, with Donald Trump)? At what point can you say, I'm not an insomniac, I just happen to have a body that only needs that much?