I'm overly worried about a friend of mine.

I'm going to try to keep this short but tell you everything important.

I live in the Netherlands, my best friend lives in Georgia, USA. We only talk through Kik and we also have each other added on Skype.

I'm constantly worried that something bad happened to him. It's 1:40 PM at the time I'm writing this and he hasn't sent me any messages yet.

We have very active conversations, with instant replies, around 3 hours a day or so. So I know that he would message me if he got busy or just woke up.

He often sleeps until 1 PM, almost daily, so I know I shouldn't be so worried. But I'm literally turning sick over this. I know he's probably just sleeping but every single time I'm just terrified.

Please, I beg you, give me advice on how to stop being so worried about him every day. I know he's fine, but I don't know how to convince myself that he is.

EDIT: He just replied to me, and it's as I keep trying to tell myself, he just slept late. But this has to stop, I'm tearing myself apart every evening about him...