Using phone before bed causes insufficient sleep that weakens many cognitive functions, “including memory, concentration, and attention” which are vital for everyday activities (Ellis et al., 2014).

... the continuing usage of the smartphone at home and after the work may inhibit the employees “to fully recover from work activities while away from the office, especially at night. Employees often use smartphones for work within an hour of going to bed, and many sleeps within reach of their smartphones” (Lanaj et al., 2014). This causes insufficient sleep that weakens many cognitive functions, “including memory, concentration, and attention ,” which are vital for everyday activities (Ellis et al., 2014).