My iPhone 5s screen dark blue then fades to black

I haven't touched it the whole day and i pick it up and its like this please help what is this?!

Try restarting it. Hold the power button and the home button at the same time for 10 seconds

If it's not physically broken the holding down the home and lock button at the same time (like you would take a screenshot) but hold it longer! Until appel logo appears! This should fix it.