Laziness and drowsiness can be caused by various factors. Starting from lack of sleep/rest, stress and maybe there is a certain disease suffered by the person. There are several ways to reduce laziness and drowsiness by improving healthy eating patterns, managing stress, improving sleep patterns, and exercising. But if that can't reduce your laziness and drowsiness, you can consult a doctor to find out what the cause is, and can be treated immediately by a doctor if it is considered very disturbing for someone to do activities.