I can endorse it as I have personally experienced this. I was in deep sleep in the evening after returning from work when my friend called me while my phone was charging. I woke up and picked the phone to answer. I don't know what happened, I fell down on my head and got injury. In a minute or so I got my conscious back and found my friend saying in phone what happened,etc. thank God I am alive and alright. My phone was Nokia 6230.