Holiday sleeping

For this holiday season I have another week off work yet. In the meantime I may sleep in as I please on most mornings. I am naturally a morning person, very much early to bed and early to rise. Lately I have been staying up a bit later but then typically sleeping for well over nine hours then still moving slowly, staggering downstairs mid-morning and today it was only during my subsequent workout that I felt the cobwebs blowing off. I wonder if I really need all this sleep or if I ought to be stricter with myself. I am certainly getting less done than usual.