00:01
so how is sleep measured
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and is my wearable device a good measure
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of my sleep
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so when you hear all this info about
00:09
sleep you might begin to wonder
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how do we know this stuff so the gold
00:14
standard measurement of
00:16
sleep is via a polysomnograph or psg
00:20
the psg monitors a whole range of bodily
00:23
functions
00:24
including brain activity which is
00:26
measured with
00:27
an eeg or electroencephalogram
00:30
measures eye movements which are
00:32
measured with an eog
00:34
or electro ocular graph muscle activity
00:37
is measured with an emg or
00:39
electromyograph heart rhythm with an ecg
00:43
or electrocardiograph and breathing
00:46
function
00:47
is measured with respiratory airflow
00:49
respiratory
00:50
effort and pulse oximetry measures which
00:53
are taken with
00:54
different devices a key point here
00:58
is that if you own a wearable device
00:59
that is supposed to tell you about your
01:01
sleep stages
01:02
or something like that it is unlikely
01:04
that it measures as many bodily
01:06
functions as a psg
01:08
so it's simply not going to be as
01:09
accurate so if you worried that your
01:11
device is telling you that you're not
01:12
getting enough
01:13
deep sleep or some such don't panic
01:16
it's probably just that your device
01:18
isn't very accurate