They could have had them not use a screen for some parts of the study and use it for others, but after reading the article and skimming the paper I can’t see any indication they did this. It seems they just sent out a survey to 45k people and concluded people who use their phones in bed go to sleep later so that must be the cause.
They could have had them not use a screen for some parts of the study and use it for others, but after reading the article and skimming the paper I can’t see any indication they did this. It seems they just sent out a survey to 45k people and concluded people who use their phones in bed go to sleep later so that must be the cause.