Try to readjust and have a healthy balance. This server is no doubt addictive. I may be wrong but, the possible reason you can't sleep is because when you play any game for too long, it stimulates your brain. When your brain is constantly stimulated it also means it is actively running. When your brain is actively running, it makes a person experience sleeping problems. In relation to the game I suppose youre at a stage where u think of a lot of factors such as marketing strategy /thinking of fighting strategies/thinking of getting richer etc in the game. Therefore with my reasons + those questions in mind + you staying in game for long hours will make you lose sleep. In the long run, it may be harmful to your health. So I suggest, if you cant sleep, try and have a healthy balance with the game. Don't over do it. Be patient with the game :)
Hope this Helps.