Why won't my phone turn on?

Last night, I went to sleep while using my phone. I don't remember what I was using it for (maybe Facebook). It was already on low power. I feel asleep. When I woke up, my phone and charger lead were underneath me. I tried turning on my phone by the conventional method of holding the power button but nothing happened. This usually does not happen - the previous night, my phone died over night in the same manner, but it still turned on the next morning even though it had 0% battery.

I have tried the every way to turn it on suggested on the Samsung website. Nothing is happening, my phone is not responding to anything.