ios 8.3 battery loss on standby

Hi All,

I recently updated to ios 8.3 after a long wait. I did it via itunes on my mac.

There is a comparatively faster battery drain while i am using phone.

But what worries me even more is that i am losing up to 25% battery while my phone is on stand by at night.

So during 7 hours of my sleep time, i lost like 24% battery without even using the phone !

Any suggestion how to fix this ?