Insomnia is experienced when the patient has chronic difficulty falling asleep, frequent awakenings from sleep, and/or short sleep or nonrestorative sleep. It is the most common sleep-related complaint and includes symptoms such as irritability, excessive daytime sleepiness, not being able to fall asleep, and fatigue. Anxiety is a vague, uneasy feeling of discomfort or dread accompanied by an autonomic response. Fatigue is an overwhelming sustained sense of exhaustion with decreased capacity for physical and mental work at a usual level. Sleep deprivation is a condition caused by dyssomnia and includes symptoms caused by illness, emotional distress, or medications.
