In most cases, people wake up with no memory of the messages they have sent to any number of unintended recipients, reports Radio Australia.

Termed sleep texting, the phenomenon is expected to soon affect much of the population as smartphone usage becomes so automatic it invades our subconscious.

Sleep Services Australia medical director Linda Schachter said people had been performing semi-purposeful behaviours in their sleep for years, so it was no surprise when they started texting.

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