signs of weaning !?

ashbash4 • Mommy to Carl and Cora; LOVE THE LIFE YOU LIVE; fuck what anyone says
I'm pretty sure this group is for current breastfeeding moms but I thought I'd try... 
How do I know if my child is self weaning ? 
My son is 9 months and the past 2 nights he's been tossing and turning while giggling then falling asleep!! I'm amazed because usually he needs to be nursed to sleep. Could this be a sign he is slowly weaning off the breast or is this just a phase ??
*he does nurse about 30-40 minutes before he falls asleep