Insomnia Severity Index
We used Google Forms to information, collect smartphone behaviors, internet access habits, and Insomnia Severity Index (ISI) in which a cut-off score of ≥ 15 was decided to have clinical insomnia.
We used Google Forms to information, collect smartphone behaviors, internet access habits, and Insomnia Severity Index ( ISI ) in which a cut-off score of ≥ 15 was decided to have clinical insomnia .