A patient complained of feeling constantly fatigued. It was determined that the patient averaged only four to six hours of sleep per night, and this was determined to contribute to the patient' s condition. However, the patient was not advised to sleep more. Which one of the following, if true, most helps to resolve the apparent discrepancy in the information above? ['Most people who suffer from nightmares experience them in the last hour of sleep before waking.', 'Worry about satisfying the need for sufficient sleep can make it more difficult to sleep.', 'The first two hours of sleep do the most to alleviate fatigue.', "The shorter one's sleep time, the easier it is to awaken from sleeping."]