oximation of the Sleep Period Time
window, which is the window between sleep onset and waking up at the end
of the night, then any SIB that fully or partially overlaps with the
guider is considered sleep.</p></li>
<li><p>If a guider reflects the Time in Bed then any SIB that fully
overlaps with the guider is considered sleep. In this scenario sleep
latency and sleep efficiency can be estimated and are included in the
GGIR part 4 report.</p></li>
</ol>
<p>In both cases the start of the first SIB is then cons