Battery draining on Aviators

Hi all,

its about two weeks that i noticed battery draining during night, Aviators became "one day watches", in the morning charged 100%, all day on my hand and before night shower i have about 90% battery. Take off watches and let them in bathroom until morning, and battery death...sometimes its okay and next day morning im at apprpx 85%, evening im at 70%, but next night again death...

What is going on there during the night?

Vitek