A study on the night shift functionality of the iPhone (iOS) found that the feature present in both Apple phones and Android smartphones did not have a real impact on sleep quality, according to researchers at Brigham Young University in Utah, USA. This technology is popular for making the screen more yellow and blocking out blue light at night. Until then, research has shown conclusions about a resource that only had theoretical support, and challenges manufacturers who claim to have improved sleep quality.
The study divided the results of trials with 167 people between the ages of 18 and 24 into three groups: one who used an iPhone with a bed-activated feature, another who used an active phone, and a third who did not use their cell phone at night.
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Night Shift has been on the iPhone since 2016 – Photo: Playback / Tech Tuto
The survey showed that those in the first and second groups showed only a slight difference in sleep quality, while those who did not use the phone before bed recorded better sleep quality than those who used the device – with or without a filter.
To categorize the results, university researchers divided participants into six and seven-hour sleep groups per night. The team with seven hours of sleep found a slight difference in the quality of sleep based on the phone’s use with or without a filter, the closest value to the recommended eight to nine hours. On the other hand, in the same group, individuals who did not use the phone before bed enjoyed better sleep quality.
Among participants who slept only six hours, there was no difference in the results of whether or not the night mode was implemented. According to the head of the research, statistics show that physical fatigue may play a more appropriate role in the quality of sleep than a blue light filter because people who are very tired will fall asleep regardless of what they did before going to bed. According to him, this factor would rule out significant influence from the use of phones with or without the Night Shift feature enabled.
Blue Light Filter on Samsung Cell Phones – Photo: Palo Alves / Tech Tuto
Parameters considered in the study include total sleep duration, quality, wakefulness after sleep onset, and time taken for each group to fall asleep.
The blue light emitted by phones interferes with sleep cycles and the secretion of melatonin, which is thought to be a sleep hormone. So, to reduce blue light emission and eye wear before bed, the manufacturers will use the blue light filter feature to help screen colors and show warmer tones after sunset.
Although this feature was initially introduced on Apple phones in 2016, most smartphones today have some sort of functionality that promises to reduce the vulnerabilities caused by using screens at night. It is worth noting that this is completely different from the dark / night mode that follows a dark or completely black background in the application interface.
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