Table 1.
Descriptive statistics and group differences on the Sleep Disorders Questionnaire.
Table 2.
Age differences in whole night sleep architecture.
Figure 1.
Relative variability of sleep measures.
The Coefficients of Dispersion (CoD) are ordered from highest to lowest for Young adults (Panel A) and Older adults (Panel B). TST, total sleep time; SE, sleep efficiency; WASO, time awake after sleep onset; SWS, slow wave sleep; REM, rapid eye movement sleep; MAD, median absolute difference from the median; Mdn, median.
Figure 2.
Sleep spindle density values across the night.
The distribution of sleep spindle densities for each third of the night in Young adults (Panel A) and Older adults (Panel B) are shown. Both group-level (boxplots) and individual-level (dotplots) data are provided for each third of the night.
Figure 3.
REM density values across the night.
The distribution of REM densities for each third of the night in Young adults (Panel A) and Older adults (Panel B) are shown. Both group-level (boxplots) and individual-level (dotplots) data are provided for each third of the night.
Figure 4.
Distribution analysis for whole-night phasic events.
Sleep spindle data are presented in the left panel and REM density data are presented on the right panel. The bar charts at the top are the Harrell-Davis estimates, and associated standard errors, for each decile in each age group. The charts at the bottom are difference scores, with corresponding 95% CIs for each decile (estimate for Older minus the estimate for Young); difference scores with CIs not containing zero (dashed line) are statistically significant at p<.05.
Figure 5.
Distribution analysis for sleep spindle density across the night.
Sleep spindle density data for the first (left panel), second (middle panel), and last (right panel) third of the night are shown. The bar charts at the top are the Harrell-Davis estimates, and associated standard errors, for each decile in each age group. The charts at the bottom are difference scores, with corresponding 95% CIs for each decile (estimate for Older minus the estimate for Young); difference scores with CIs not containing zero (dashed line) are statistically significant at p<.05.