my iphone 5s has stucked in loading circle for no reason

hi,

my iphone 5s has stucked in loading circle mode and it wont come out.

here is what happend, i was using my iphone last night and it was fine. i Slept and the 8AM alarm didnt stardt.

So I thouth it might be battery issue, so i pluged it in to charger and waited for about an hour but no changes.

So i hold the home and power button together to jump start it but since then it stucked in loading circle mode and no changes happend since then

what is happening?

What am i suppose to do?