No texting when you should be sleeping. ScienceDaily is reporting results of a sleep study that found teenagers who excessively used their cell phone were more prone to disrupted sleep, restlessness, stress and fatigue. An abstract of a paper detailing the findings is to be presented today at SLEEP 2008, the 22nd Annual Meeting of the Associated Professional Sleep Societies (APSS).

Authored by Dr. Gaby Badre of Sahlgren's Academy in Gothenburg, Sweden, the study focused on 21 healthy 14-20-year-old subjects with regular working/studying hours and without sleep problems. Of those, a control group made fewer than five calls and five text messages a day. The other half of the subjects made more than 15 calls or 15 text messages a day.

According to the study:

...When compared to subjects with restricted use of cell phones, young people with excessive use of cell phones (both talking and text messaging) have increased restlessness with more careless lifestyles, more consumption of stimulating beverages, difficulty in falling asleep and disrupted sleep, and more susceptibility to stress and fatigue. They behave more like larks than owls, suggesting a delayed biological clock."

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