iPhone Night Shift feature Doesn’t Improve Sleep
The iPhone’s Night Shift feature doesn’t actually improve sleep,
according to a new BYU study.
Night Shift uses the clock and geolocation of your device to determine
when it’s sunset in your location. Then it automatically shifts the
colors of your display to warmer colors. In the morning, it returns the
display to its regular settings. Since blue light from phones is believed
to disrupt melatonin secretion and sleep cycles, the feature is said
to offer users a better night rest.
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BYU put the theory to the test…
To test the theory, BYU psychology professor Chad Jensen and researchers
from the Cincinnati Children’s Hospital Medical Center compared
the sleep outcomes of individuals in three categories:
those who used their phone at night with the Night Shift function
turned on, those who used their phone at night without Night Shift
and those who did not use a smartphone before bed at all.
“In the whole sample, there were no differences across the three groups,”
Jensen said. “Night Shift is not superior to using your phone without
Night Shift or even using no phone at all.”
The study included 167 emerging adults ages 18 to 24 who use cell
phones daily. They were asked to spend at least eight hours in bed and wore
an accelerometer on their wrist to record their sleep activity. Individuals
who were assigned to use their smartphone also had an app installed
to monitor their phone use.
The measured sleep outcomes included total sleep duration, sleep quality,
wake after sleep onset and the time it took to fall asleep.
You can read the full study in Science Direct.