Got it. Thanks Stephanie.
I have another question about the online EEG filters. What the online cut-off frequency of EEG recording in the SHHS1 dataset? I just know the sampling frequency is 125HZ.
Who can explain what the meaning of "No Intervening period bad EEG" as suggested by the variable 'restan4'?
Thanks for your reply.
Still a question about TIMES34P. Is it calculated by （Time in stage 3-4 sleep）/( total sleep time) ? The denominator is the time excluding all period of wake?
Is there any variable about the percentage of deep sleep?
I want to find a measure to judge the sleep quality such as is it a restorative sleep or not?
There are two variables for sleep efficiency, SLP_EFF and SLPEFFP. Would you please figure out the difference of them for me? Sometimes, there is no SLP_EFF available but SLPEFFP always has a value.
Moreover, for some subjects, the time durations recorded by SPonsetP are much larger than Slplatp. I wonder what's the state for those subjects, resting with eye closed in bed or active not in bed?
Thanks. I got it.
Another question, is there any variable to represent the sleep-restorability in the morning?
Thank you very much for your quickly reply.
So in SHHS1, does the edf data start to be recorded before (at least not later ) than the light out? There is a latency between the start of recording to light out? Is there a variable representing for this ?
I have found a variable 'StOnsetP' in SHHS. It's described as "Sleep onset time" and united as time. However, it has a numerical value instead of a time. This confused me. Who can kindly explain the meaning of its value and its correlation with the variable 'slplatp' (Sleep Latency, unit: min) for me?
Thanks a lot.