Later sleep timing predicts accelerated summer weight gain among elementary school children: a prospective observational study

Table 2 Definition of Sleep Parameters

Sleep Parameter	Definition
Sleep onset	The first minute of the first three consecutive epochs scored as sleep
Sleep offset	The last minute of at least 5 consecutive minutes of sleep occurring before 15 min after the reported wake-up
Sleep Midpoint	Midpoint between sleep onset and sleep offset
Total sleep time	total number of minutes scored as sleep between sleep onset and offset
Intraindividual Variability of Sleep Midpoint	Root Mean Square of Successive Differences of Sleep Midpoint The square root of the average difference in sleep midpoint across successive nights^a

^a\( \sqrt{\left[\left(\mathrm{night}\ 2-\mathrm{night}\ 1\right)+\left(\mathrm{night}\ 3-\mathrm{night}\ 2\right)+\dots +\left(\mathrm{night}\ \mathrm{n}-\mathrm{night}\ \mathrm{n}-1\right)\right]/\mathrm{n}} \)

ISSN: 1479-5868