According to a report in the Telegraph (UK), a study has found that teenagers who used their mobile phones frequently (making more than five calls or sending more than five text messages per day) were more likely to experience disrupted sleep, restlessness, stress and fatigue than those who used their phones less frequently.

The researchers also found that those who used their phones most frequently appeared to have a more frantic lifestyle and were more likely to drink caffeine to help them stay awake. They also stated that there appeared to be a connection between intensive mobile phone use and health-compromising behaviour such as smoking, snuffing and use of alcohol.

Reference :

Devlin, K.  2008  Mobile phones stop teenagers getting a good night’s sleep  Online, available at : http://www.emfacts.com/weblog/?p=905  (Viewed on 22.6.08)