A study on the night shift function of the iPhone (iOS) showed that according to researchers at Brigham Young University in Utah, United States, the feature on both Apple phones and Android smartphones may not have a real impact on sleep quality . The technique became popular for making the screen more yellow and blocking blue light at night. Research shows results about a resource that, until then, had only theoretical support, and challenges manufacturers about improving sleep quality.
The study compared the results of experiments conducted with 167 individuals between the ages of 187 and 24 who were divided into three groups: one who used the iPhone with the feature before bed, the other who used the phone with the function , And the third who did not use his cellphone at night.
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Night Shift is on iPhone since 2016 – Photo: Playback / TechTudo
The survey showed that people in the first and second group saw only a minimal difference in sleep quality, whereas individuals who did not use the phone before bed had better sleep than individuals who used the device or had no filters. Registered a quality of.
To classify the results, university researchers divided the participants into groups of six and seven hours of sleep per night. The group that had seven hours of sleep, the recommended value of eight to nine hours, observed a slight difference in sleep quality based on telephone use with or without a filter. On the other hand, in the same group, individuals who did not use the phone before bed experienced better sleep quality.
Among the participants who slept only six hours, there was no difference in the results, whether the night mode was active or not. According to the research leader, statistics suggest that physical exhaustion in sleep quality may play a much more relevant role than blue light filters, because very tired people fall asleep regardless of what they do before going to bed. Huh. According to him, this factor would control a significant effect from the use of the phone with or without the night shift feature.
Blue light filter on Samsung cell phone – Photo: Paulo Alves / TechTudo
The parameters considered in the study include the total duration of sleep, quality, awakening, and time each person was taken to sleep after sleep onset.
The blue light emitted by the phone impedes the sleep cycle and the secretion of melatonin, which is considered a sleeping hormone. Therefore, to reduce blue light emission and eye wear before bedtime, manufacturers use the blue light filter feature to help color the screen and display warmer tones after sunset.
Although this feature was initially launched on Apple phones in 2016, today most smartphones have some kind of function that promises to reduce screen usage at night. It is worth remembering that this is quite different from the Dark / Knight mode which adopts a dark or completely black background in the application interface.