Hi!
It seems to be very common around this age that LOs begin waking. Your post is very common lately I've noticed.
I believe it is most def SA as my LO went through it too. Usually a hand on his bottom did the trick. Also, new found mobility! Many babies begin standing or crawling etc. Keep in mind there is also a regressions said to be around 9-11 mths or so.
EASY looks just fine to me
I would also consider medicating for meds if you find teething might be the culprit too

!
How is he upon waking at head NWs? Upset? Cry? Happy/calm? Unsettled? Anything new in his routine that you can think of? New foods, sleeping arrangements?