How can i log out of my mobile facebooke messenger app?

[Nichole]

My phone automattically updated to the new facebook messenger application, and apparently the new "fixes" on that application are that there is no longer an easy way to log out. I like using the messenger applicaton because when I am not in class I can just loggin and chat with my friends. But I am very annoyed that I can no longer loggout of the application because now, I am getting messages when I am asleep, when I am testing, trying to study, it is really all just very irritating. I would highly appreciate it if anyone had any insight as to what I could do, or am I just going to have to uninstall the facebook messenger app completely?