Should i turn off my Iphone at night while sleeping?

Can anyone please tell me should i turn off or on my iphone at night while sleeping.
I downloaded an apps called battery doctor, on it and it tells {turning off is ok but when you turn on the battery will be gone extremely } i don"t know what to do can some one please tell me.

Makes no sense that turning the phone off would deplete the battery. You turn your computer off sometimes don't you? I hope so anyway. You don't have to turn it off every night but you should turn it off once in awhile to allow it to 'rest' and reset.

No not at all in fact that is the ideal time to actually charge the phone while you are sleeping and then when you awake in the morning you have a fully charged fresh phone.

That app doesn't make sense. I charge my phone 3 hours before i sleep then turn it off over-night and its at 100% in the morning when i switch on ready for the day.

No, I never shut mine off ever. It you want it silent just flip the little mute switch in the corner.