I'm so glad you posted this thread.
I'm exactly the same. I still worry about not falling asleep, but once I am I allow myself 8 hours; however weekends without an alarm clock I easily sleep 10-11 hours. I didn't want to post it, because I know how bad it is at first and a lot of people on here suffer badly from insomnia. I'm almost sure some may even relapse because of it. So me saying 'hey I can sleep forever' just didn't seem right. Thanks for letting me know I'm not alone. I guess our bodies just convert back to the natural sleeping pattern everybody has. Ours just need more.