Which condition is characterized by an urge to move the legs, especially in the evenings?

Restless Leg Syndrome (RLS) is a neurological condition known for creating an uncontrollable urge to move the legs, often accompanied by uncomfortable sensations in the legs. This urge typically intensifies during periods of inactivity and is especially prominent in the evenings and at night. Individuals may find temporary relief by moving their legs, which differentiates it from other sleep or movement disorders.

In contrast, sleep apnea is primarily characterized by pauses in breathing during sleep, leading to disrupted sleep patterns but does not involve an urge to move the legs. Insomnia refers to difficulty falling asleep or staying asleep, which can occur for various reasons, but it is not specifically associated with leg discomfort or the desire to move them. Periodic Limb Movement Disorder involves involuntary flexing and extending of the legs during sleep but does not typically involve the same urge as RLS; rather, it is defined by the involuntary movements themselves. Understanding these distinctions helps in recognizing why Restless Leg Syndrome is the correct answer.