Holy cow can I relate! My daughter is 7 and her lifes dream was to have her BFF sleep over. Well, the other mother and I agreed this spring break we'd allow it.
Wowza! Thank goodness I waited until the morning of the sleep over day to tell her because she immediately went into planning mode and virtually freaked out. She was rearranging couch cushons on the floor for a hide out, negotiating the use of the large outdoor camping tent, planning food and snacks and every second of this sleep over. I finally told her no more planning unitl 30 min before her friend arrived.
The girls had a wonderful time.
The next day my over tired daughter was a crab - didn't want to clean up the mess they made, nothing was fun, she was bored, bored, bored and wouldn't stop asking when the next sleep over was going to happen.
*sigh*
I hear ya... that's all I have.....