8/9 month sleep regression???

Joanna
My baby is 8 1/2 months old and must be going through some kind of sleep regression. Since about 4 months he's been on a great sleep schedule...sleeping around 10/11 hrs per night. Now all of a sudden he's up every couple of hours. Am i alone in this? Anyone else going through the same thing? What the Heck it's going on? TIA