The Very First Time Katniss and Peeta Slept Together?

In the first hunger games that Peeta and Katniss were in together

I HAD NO IDEA THEY DID EACHOTHER! I'm jelous LOL jk jk

I didn't think they actually had sex, i thought they just slept together. Like went to sleep. Because each others presences helped calm the nightmares.
But i guess i could be wrong. But i wont' accept it lol. I'm going to keep my own theory of them just sleeping because i don't like them together..

I may be forgetting something, but the first time I remember them sleeping together (as in actual sleep), was the first night that they teamed up in the games after they were told that two people from the same district could both win. I could be wrong though.
I dont think this was your question, but since other people mentioned it, I wanted to say that I got the impression that the first time they slept together, as in had sex, was in the end, right before Peeta asks Katniss, "you Cinta me, real atau not real?" Again, though, I could be wrong.