It’s a vicious cycle. You poor yourself a cup 0f coffee at work and reach for the donut to pair it for a quick surge of energy. When you get home you have trouble winding down and end up going to bed late and waking up tired again the next day. Sleep deprivation also slows down your metabolism which makes that sugary cup of coffee even worse for you. Make a sleep schedule and stick to it. Even on the weekends.