The PMHNP is evaluating a new patient, a 31-year-old woman who was referred by her primary care provider (PCP). She complains of feeling fatigued for the past 3 months, and this fatigue has caused her to stop socializing. Upon further questioning, she reports feeling uncomfortable sensations in her legs in the evenings. She describes the sensations as burning and tingling, and states that she has to walk around to get any relief. Which diagnosis best fits her clinical picture?

Choice A reason: REM sleep behavior disorder involves acting out dreams due to loss of normal muscle atonia during REM sleep. It typically presents with violent movements or vocalizations during sleep, not with uncomfortable leg sensations or the urge to move the legs. Choice B reason: Restless legs syndrome is characterized by an urge to move the legs, often accompanied by uncomfortable sensations such as burning or tingling, especially in the evening or at rest. Symptoms are relieved by movement and can interfere with sleep and social functioning, matching the patient’s description. Choice C reason: Circadian rhythm sleep-wake disorders involve misalignment between the internal circadian clock and the external environment, leading to sleep disturbances. These disorders do not typically present with sensory symptoms in the legs. Choice D reason: Hypersomnolence disorder is marked by excessive daytime sleepiness despite adequate sleep duration. It does not involve sensory discomfort or the urge to move the legs, making it an unlikely diagnosis in this case.