Any advice on keeping up with my friends at a party?

Herb

So I'm very pregnant, and feeling it. I've got a party to go to tomorrow night and I want to be able to stay up and be involved with it all. It's going to be a late one, I'm talking 3/4am maybe even later, with lots of dancing and drinking and all.

I need any tips you all have to be able to stay awake and have a good amount of energy not to be a party pooper or bring anyone down, I also dont want to be having mood swings so any tips to avoid that would be great!