People with the rare condition send incoherent text messages while asleep to their friends and family - completely unaware that they are doing it.
Sleep specialist Dr David Cunnington, of Melbourne Sleep Disorder Centre in Australia, said patients had reported incidents of sleep texting - and he has advised people to leave their mobile phones outside the bedroom.
I did what? Dr David Cunnington claims 'sleep texting' sufferers send incoherent messages to friends and family members - and have no recollection of doing so
'It is one of those things that happens, but it is very rare, and certainly not a common trend.'
Unsurprisingly, there are no studies into sleep texting - but a similar phenomenon, sleep emailing, was studied in 2008.
Researchers at the University of Toledo reported the case of a woman, 44, who would compose emails while sound asleep. She had no recollection of sending the emails when awake.
Dr Cunnington said cases of sleep emailing were more common, and were likely to have a more detrimental effect on the lives of sufferers.
Dr Cunnington (pictured) said people struggling to get a quality night's sleep should keep their phones out of the bedroom
Dr Cunnington described sleep texting as the result of people having too much to do during waking life.
He explained: 'People are doing so much during a normal day that it can mean that they feel like they're "on call" even at night.
'Because it's so easy to receive emails constantly, and get notifications from smartphones, it becomes more difficult for us to separate our waking and sleeping lives.'
Dr Cunnington said people struggling to get a quality night's sleep should keep their phones out of the bedroom.
'If your phone is on the nightstand, then it will be more difficult to have a good night's sleep without feeling compelled to reply to a message or check your Facebook account.
'The key point is that people need to respect their sleep, and make an effort to switch off at night.'
By Frank Thorne taken from http://www.dailymail.co.uk/health/article-2064703/Daily-stress-leading-rise-sleep-texting-expert-claims.html#ixzz1eXdYBS84