Sleep, Pizza, and Nightmares

Don't the experts say that when you are dreaming, you aren't in the deep sleep that gives you the rest you need? I could be wrong, but I believe that's what they say. Ever since I became pregnant again, I've had the most impossible time sleeping. I wake up about 3-4 different times in the middle of the night, for no apparant reason (well of course sometimes it's for the pregnant nightly potty break...but the other times I can't account for). Lately I've also been having tons of nightmares. Now when I was pregnant with Cayden, I used to dream and have some nightmares, but not as many as I've been having lately. One night I dreamt about this HUGE snake that was trying to catch me, and another night it was about some people I know getting into a car accident. Three nights ago, I had a dream that while I was pregnant, I got a huge tummy tattoo (then I sat around with Nicole Richie and asked her if you are supposed to avoid tattoos while pregnant)!!! It was a psychotic dream all around. Not only do I not have any intentions of getting a tattoo, but I KNOW you aren't supposed to get one while pregnant, not to mention, who gets a tattoo on their STOMACH??? You'd be looking to have that thing all deformed by the time you'd had a few kids, from it stretching out....then shrinking...etc. My husband thought it was a pretty amusing dream though :-)
Two nights ago something was different though. Tyler and I ordered a Dippin Strips pizza around 9 p.m. while we played golf on our play station (that's our favorite game). Somehow I managed to match Tyler by eating my entire half of the pizza (he gets his w/out cheese...weird I know). I never can eat that much pizza...so I was actually slightly proud of myself, although you really shouldn't be proud of yourself for eating badly!? Anyway...I was so full but it felt good, and that night I slept through the ENTIRE night. I didn't wake up until the alarm clock went off!!! So...I'm wondering if it was because my tummy was so full so the baby was happy??? Maybe I wake up in the middle of the night because I don't put enough in my tummy before bed?? I find that hard to believe because Tyler and I are big late-night snackers. Pizza is such a comfort food though....mmmmm I love it.
Anyway...that was a big post about nothing, but any insight would be great. I don't think it's a good idea for me to be eating half a pizza every night just so I sleep better, HAHAHA...I mean, not if I don't want to gain 100 lbs during this pregnancy, and have a baby that's unhealthy and addicted to pizza!!!!!!!!