The “night mode” of Iphones which avoids the effects of blue light would ultimately be just a gadget with no effect on the quality of sleep.
- 67% of French people say they have had sleep disorders.
- These disorders affect women more strongly (58%) and lower socio-professional categories (54%).
According to a new study published in the journal Sleep Healththe activation of “night mode” Iphones don’t help you sleep better.
Melatonin production
the “night mode” iPhones changes the screen from a blue light to a yellow/orange tint, in order to prevent the blue light from stimulating the production of melatonin, the hormone that causes the body to wake up. To analyze the impact of this change, scientists from Brigham Young University and Cincinnati Hospital recruited 167 college students, and asked them to spend at least eight hours in bed, measuring their sleep using a device attached on their wrist.
After their experiment, the researchers divided the young people into two distinct groups: those who slept an average of seven hours a night, and those who slept less than six hours. Participants were then randomly assigned to one of three conditions for the hour before bedtime (for seven consecutive nights): use of iPhone with the option “Night Shift” enabled; using the iPhone with the option “Night Shift disabled“; and no use of the telephone.
Spsychological stimulation
Conclusion: the quality of sleep of the students was similar with or without the activation of the night mode of their phone. On the other hand, the quality of the nights was better for those who had not consulted their telephone in bed. According to the researchers, it is therefore not the “night mode” which may or may not prevent sleep, but rather the psychological stimulation caused by consulting the iPhone before going to bed. To avoid sleep disturbances, it is better to turn off your phone, well before closing your eyes.
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