I drink a lot of coffee lately as I need energy and to be able to stay awake . I do not know why but I prefer to do my late night revision . Maybe I am a night owl . So I drink coffee as the pick - me - up in the morning because coffee promotes me alertness and attention . And yeah , I'm aware of the stimulatory effects of caffeine . I'm having a difficulty falling asleep now . I am so tired -.-
p / s : I'm not a heavy coffee drinker .