Will I ever catch up on my sleep?

I'm definitely not 26 anymore--and I'm feeling it.  There are a few of you who may be able to sympathize with me and feel my pain when I say that I no longer can function on just a few hours of sleep.  What happened to those days when you could pull an all-nighter and still be able to go, go, go the next day?  It has been too long since I've had to pull an all-nighter but I thought I had it in me to be able to at least function with just a couple of hours of sleep--I am wrong!!  My new year was off to a pretty good start until I was called in to operate at 11:00 PM on a Sunday night!  By the time I got home and ready for bed it was already 2:30 in the morning.  I think I was running on pure adrenaline most of Monday but I began to fade pretty quickly once it hit around 4 in the afternoon.  Feeling exhausted, I had tried to get to bed early last night; once again, the best laid plans of mice and men...I may have gotten a little over 6 hours of sleep but it was definitely not enough to make me feel refreshed or caught up on my sleep.  I guess I shouldn't complain because in a few more days, all I'll do is sleep--yes, my 4th cycle of chemo is coming up.  Yay me!