Patterns of smartphone use and their impact on mental health are being extensively studied due to the growing dependence of the device in people’s lives.

A recent study tracked late-night smartphone usage in 79 adults with recent suicidal thoughts for 28 days. People using phones late between 11 p.m. and 1 a.m. showed a higher risk of suicidal thoughts the next day, whereas those who actively used the keyboard beyond midnight hours showed a lower risk.

The findings are published in JAMA Network Open.