Which disorder is characterized by distressing sensations and urges to move the legs?

The disorder characterized by distressing sensations and urges to move the legs is indeed Restless Leg Syndrome (RLS). This condition is defined by the overwhelming urge to move the legs, often accompanied by uncomfortable sensations, which can lead to significant distress and impairment in daily functioning. Individuals with RLS frequently experience these sensations in the evening or at night, potentially interfering with their ability to fall asleep or stay asleep, thereby affecting their overall quality of life.

Restless Leg Syndrome is specifically distinguished from other disorders. Obstructive Sleep Apnea involves interrupted breathing during sleep and does not primarily pertain to sensations in the legs. Nightmare Disorder centers around recurrent distressing dreams that disrupt sleep but is unrelated to leg movement or sensations. Substance/Medication-Induced Sleep Disorder relates to sleep disturbances secondary to the effects of substances or medications, but again, does not focus on the leg sensations typical of RLS. Therefore, Restless Leg Syndrome is the most accurate diagnosis based on the symptoms described.