Please STTN, I beg you + "forgetting" skills..?

All right, so my kid WAS sleeping through the night.  Sometimes he would get up once but a good portion of the time he would sleep 8-6.  And it was glorious.

Then we hit 4.5 months and he started waking.  A lot.  He will sleep the first 5 hours no problem but then it's up every. single. hour.

I've been doing the No-Cry Sleep Solution and it works (he is no longer nursing to sleep) however, I don't think the reason he was waking was because he needed me to soothe him back to sleep.  We have narrowed it down to one of two things: it's either his teeth (the other night when he woke up he gnawed on my finger so hard I ended up giving him Tylenol) or because he is forgetting how to roll!

He knows how to roll both ways.  However, ever since he started having crap sleep, he will wake up all upset because he can't figure out to get off his tummy.  And we have noticed he is not doing it while awake anymore.  He was rolling tummy to back no problem well before he started rolling back to tummy but now it's like he forgot the first skill.  So weird.

I guess I'm just ranting.  And hoping against hope that he won't wake every hour tonight.  It's been 3 weeks of this and I'm nearing the end of my patience.