Top Definition
The inability to get a decent night's sleep because of one's self-imposed obligation to read and reply to every single late night text. This thus results in a long drawn out dialogue which probably would have only lasted about 5 minutes over the phone.

An ailment often experienced by people who feel so self-important that must respond immediately to every form of technological communication.
Boss: Why are you so lethargic and lackluster at the office today?

Employee: I'm suffering from textsomnia. I couldn't get a wink of sleep last night because my friend kept texting me about the most random stuff...like Moby Dick...and floggings...and the caloric count of coconuts.
by VitruvianMan October 09, 2009

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