During a study conducted at Leuven University, Belgium, 2,500 youngsters, aged 13 to 16, were asked how often they were awakened by incoming text messages on their cellular phones and how tired they felt at various times. Ten percent reported being awakened by messages at least once a week. The sleep of 3 percent was interrupted in this way every night.
Belgias asuva Leuveni ülikooli korraldatud uuringu käigus küsiti 2500 noorelt vanuses 13 – 16 aastat, kui tihti äratavad neid üles mobiiltelefonitsi saabuvad tekstisõnumid ning kui väsinuna nad end tunnevad. 10 protsenti ütles, et tekstisõnumid äratavad nad üles vähemalt korra nädalas. 3 protsendi und häiriti sel kombel igal ööl.