Crises management, or lack of, leaves no time for routine matters or for enjoyment of the simpler things in life. These include boredom, daydreaming, stress, guilt, anger and frustration all reduce concentration in the classroom. Stress can lead to sickness that will definitely blow your schedule apart. Stay physically fit. Yes, you can schedule good quality time for exercising and not feel guilty, knowing that it will keep you healthy in the long run.
Exercise is the best known way of reducing anxiety-producing stress.