Can't seem to stop sleeping!!

I've had a pretty wonderful pregnancy...nausea in my first trimester, heartburn in my third, but overall great! Now I'm 37wks and at 36 during my check I was dilated to 2cm, baby at 0 station (engaged), and 90% effaced. During the past week I can't seem to get enough sleep! I actually start getting fussy like a toddler after being up for "too long," and, if left to my own devices, would probably sleep 18hrs a day. It's like I'm living this final month in a series of naps. Even at work, I'm falling asleep during a 12-hr shift while chatting on my patients. Anyone else experiencing this?? I lay down for an hour nap and wake up 4hrs later, groggy AF! Ready for Ms. Avery to be here so I can get back to feeling like some modicum of me again!