How about this..

http://sleep.health.am/sleep/more/pe...ents-in-sleep/

Quote:

PLMS and RLS may be associated with some medical conditions, including uremia, anemia, chronic lung disease, myelopathies, and peripheral neuropathies. Use of medications, such as tricyclic antidepressants and lithium carbonate, and withdrawal from benzodiazepines and anticonvulsants may all induce these disorders. Other movement disorders that should be differentiated from PLMS include the hypnic myoclonus, nocturnal leg cramps, and jerks associated with long-term use of l-dopa.

and

Furthermore, many patients with PLMS also suffer from other sleep disorders, including SDB and REM sleep behavior disorder.

end quote.