I was updating my iPhone 5S, suddenly the screen went black and now it won't turn on. Plugged it into my computer and it said "USB Device not recognized..." HELP!!

I just went to update my iPhone 5S as it asked me to, and it got to the point with the apple logo on the screen and the black loading bar underneath, but then the screen went black and the phone now won't turn on? I went to plug it into my computer and it said "USB Device not recognised"..
PLEASE HELP ME! It's 1am here in england, I need to be up at 6am for work and won't be able to get up without an alarm... my only option is so stay awake!

Nothing happened, i managed to get my computer to recognise it and now restoring... but it says 3 hours remaining?! Will i lose everything?

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