battery drain

[astro52]

I am having note 8 and this is what I get a battery back up..... is it only me or you guys are also facing.....all of a sudden there is so much battery drain on standby 

Both screen on  and and standby drain same amount of battery
I don't understand  howww

[Samsung_4W61s22]

in samsung galaxy s 6 lite there is no double tap wake option