QUOTE
...Their failure to get enough can lead to mood and personality changes, ADHD-like symptoms, depression, lack of concentration and poor academic performance.
nobody needs a cell phone to have those symptoms, it's directly related to lack of sleep. Anyone who works late in a stressfull job can end up having a hard time "winding down" before bedtime.
A lot better methodology will be required to support the claims made by this study, IMHO.