General and night-time specific social-media use along with emotional investment in social media were related to poorer sleep quality, lower self-esteem as well as higher anxiety and depression levels.
Dr Cleland Woods said: "While overall social-media use impacts on sleep quality, those who log on at night appear to be particularly affected.
"It is important that we understand how social media use relates to these. Evidence is increasingly supporting a link between social-media use and wellbeing, particularly during adolescence, but the causes of this are unclear.