Systems, devices, and method for determining and monitoring sleep disorders based on determined arousals and arousal-associated events using non-brain body signals or without requiring brain signals

A method for identifying Periodic Limb Movement during Sleep (PLMS) in a sleep study of a subject, the method comprising:

• determining arousal or arousal-associated events in the sleep study of the subject by
• obtaining data from one or more body signals, the one or more body signals being non-brain signals, and
• determining arousal or arousal-associated events of the subject using the data from one or more body signals;
• determining whether the arousal or arousal-associated events are PLMS events based at least in part on a periodicity of a plurality of such arousal or arousal-associated events.