Figure 4.
Distribution of objective sleep time estimates (self-reported sleep time/polysomnographically [PSG] measured sleep time, in 0.025 unit bins) for chronic cocaine users at week 1 and week 2 of abstinence (curves are rolling averages). Inset table shows quartiles for chronic cocaine users at week 2 of abstinence and comparison data from previously published work in persons with insomnia for whom clinical PSG was performed.3 *Seventy persons with combined sleep onset and maintenance insomnia; **Fifty-seven persons with any insomnia and observed periodic leg movements; ***Twenty-five persons with any insomnia believed to have a physical cause.