Many people continue to study while working full time. Evening classes can be exhausting, and then there is always that test you must study for or that paper you must write. It’s only a matter of time until the inevitable happens. You are stressed as hell and yes, this also reflects in your mood.
Lauren Berger’s book Get It Together is a friendly reminder on how to organize your live and the “Get It Together” (GIT) guiding principles are very helpful.