Channels will include an electroencephalograph (EEG), an electro-oculogram (EOG), a submental electromyography (EMG), EMG of both anterior tibialis muscles (separate channels for each leg), oral/nasal airflow, pulse oximetry, and respiratory effort. The PSG will be analyzed for traditional sleep staging. Measures from the PSG will include Sleep Onset Latency (SOL), Wake After Sleep Onset (WASO), Sleep Efficiency (SE), N-REM and REM percentages, Periodic Limb Movement Index (PLMI) and PLMs associated with arousal per hour of sleep (PLMAI).