Sleep in PD.

<p>Sleep Efficiency, ratio of actual sleep divided by total attempted sleep. Actual Sleep, total duration spent sleeping (not including Wake and Time to Z). Total Attempted Sleep, from time to bed to morning rise. Times Woken, number of times subject awaken during night-sleep. Wake Duration, total duration of time spent awake during night-sleep. Light Sleep, light sleep stage. Deep Sleep, deep sleep stage. REM Sleep, rapid eye movement sleep stage. Time to Sleep, the time it takes to fall asleep (a.k.a. sleep latency). *<i>p</i><0.05 between the PD and Older groups. (Young group's data are shown in order to visualize normative values.) Numbers are the effect sizes between the Older and PD groups, based on Cohen's <i>d</i> using averaged standard deviation <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0109818#pone.0109818-Cohen1" target="_blank">[25]</a>.