“…Like chronic users of other substances including alcohol, opiates, and cannabis, [7][8][9][10][11][12][13][14][15] chronic cocaine users have severely disrupted sleep 16,17 that may persist for weeks, months, or even longer (for review, see Angarita et al 18 ). Over the first several weeks of abstinence, polysomnographically (PSG) measured sleep in chronic cocaine users worsens, with shortening total sleep time, diminishing REM sleep (rapid eye movement sleep; a sleep phase characterized by rapid and random eye movements, muscle inhibition, and brain waves similar to those exhibited during wakefulness) time, increasing sleep latency, and chronically decreased slow-wave sleep time.…”