Hi Vincent,
May I consult you how GGIR define daysleepers?
According to the manual
5.6.2 Daysleepers
(nights workers)
If the guider indicates that the person
woke up after noon, the sleep analysis in part 4 is performed again on a
window from 6pm-6pm. In this way our method is sensitive to people who have
their main sleep period starting before noon and ending after noon, referred
as daysleeper=1 in daysummary.csv file, which you can interpret as night
workers. Note that the L5+/-12 algorithm is not configured to identify
daysleepers, it will only consider the noon-noon time window.
However, I found this example in my data (GGIR2.0),
ID night daysleeper sleeponset wakeup SptDuration
1002-73-4 1 1 32.36111 35.27639 2.915278
762-71-6 10 0 33.96528 34.49861 0.5333333
Is this definition of daysleeper related to sleepduration?
Thanks.
Best,
Dora