Classroom drowsiness can be caused by a number of factors, including late nights of studying, long days at work, sitting in a heated classroom after a heavy meal, a late evening lesson, or just finding the teacher or subject matter a little uninteresting.
A long lecture with a break in the middle is a great opportunity to get up and walk about. If there isn't a scheduled break, it's OK to use the toilet and walk to and from it as a kind of exercise.
Fatigue, irritability, and other symptoms of dehydration can set in after only a mild loss of fluids. If it's allowed, bringing a water bottle to class may do wonders for your concentration and energy levels.
Taking good notes in class might be the solution to your demand for mental stimulation in lecture. If there are no concrete details to record, write down your thoughts about the lecture instead.
By going to bed and waking up at roughly the same times each day, you may train your body to recognize those times as sleep and wake times, respectively.
An early morning jog might set you up for a productive day. If that isn't an option, at least let the morning light in by throwing open the curtains as soon as you get up.
It's easy to nod off at the back of any lecture hall, no matter how big or little. Being in the front row, only feet from the instructor, makes it more difficult to nod off during class.
The medicinal uses of mint are many. The ability of peppermint to activate the hippocampus, a critical area of the brain involved in alertness, memory, and other cognitive skills, is one of the most beneficial in class, aside from making your breath smell nicer.
Meditation and other relaxation practices can be useful for managing negative emotions like stress and anger, perhaps resulting in more energy and a more positive attitude. Mindfulness meditation training, even for just a few days, can assist improve focus and cognition.
If you dress for success, as opposed to comfort, you may find that you are more motivated to sit up straight, pay attention, and get things done. It might help you concentrate on the task at hand.