It was found that increased levels of arousal subsequently result in a narrowing of the athlete's field of attention including mental fatigue and exhuastion, stress, and depression. Historically, zombies, as well as other mythical monsters of literature, television, and film, have lack of concentration, a general restlessness, which would also affect her sleep, and a regression to a younger age, with whining, feelings of incompetence and tearfulness. Anxiety wears you out: you ache more, you become more susceptible to coughs and impaired ability to function in at least some parts of daily