Intra individual stability and inter individual variability of waking and sleep.

<p>Correlation of four variables between Day 1 and 3: Waking duration starting from dark onset until the occurrence of the first consolidated sleep period, running wheel intensity (RW counts/min within Run bouts), total 24-h NREM sleep amount and the mean duration of NREM sleep episodes (n = 8 mice). r- and p-values correspond to Pearson correlations between the variables. Note the remarkable intra individual stability of all four variables between the two days.