Midnight and I'm not sleeping

I'm 12 wks pregnant today and so tired. In fact I have been tired since before I found out that I was pregnant. Even though It's midnight, I can't sleep. Every time I lay down I feel like all the food I ate HOURs ago is just sitting at the middle of my throat, just hoping to come out. I'm not one of those vomiters during pregnancy. No, instead i just burp and feel like I need to run to the towelette, never really needing it. So here I am so tired, knowing that I have class at 8 tomorrow morning and there is nothing I can do. Nothing but wait for my food to hit my stomach so I can lay down without burping it up every five seconds.