I have to admit that this sounds made up, but doctors are backing it.

According to MSNBC, some doctors say they're seeing more and more cases of sleep texting.

And it's exactly what you think it is:  People sending texts in the middle of the night, while they're still asleep, and not realizing it.

Dr. Markus Schmidt from Dublin, Ohio says that sleep deprivation is the most common trigger.  When you're sleep deprived, it can trigger common behaviors when you're asleep.

One of our common behaviors is to grab our phones when they go off.  Since so many people now sleep next to their phones, when the phone goes off on the nightstand, a sleep deprived person might grab it and start texting.