All of the following are considered sleep disorders EXCEPT?

Restless leg syndrome is indeed classified as a sleep disorder. It is characterized by an uncontrollable urge to move the legs, often accompanied by uncomfortable sensations, typically occurring in the evening or at night when lying down. This condition can significantly affect the quality of sleep, leading to difficulty falling asleep or staying asleep.

In contrast, somniloquy, or sleep talking, is generally considered a parasomnia rather than a primary sleep disorder. It refers to talking during sleep, which is generally harmless and may not affect overall sleep quality. While bruxism (teeth grinding) and periodic limb movement syndrome (involuntary leg movements during sleep) can both be linked to sleep issues, they do not have the same classification as a disorder affecting the core ability to initiate or maintain sleep as seen with restless leg syndrome.

Thus, the identification of restless leg syndrome as a sleep disorder stands correct, as it directly impacts the individual's ability to experience restful sleep.