Wifi keep awake

Your android phone can either:

- keep wifi connected while sleeping (to receive notifications instantly, keep downloading, etc )

- disconnect wifi while sleeping (to save battery)



Go to Settings -> wifi -> advanced - > Keep wifi on during sleep



If the phone is maintaining an active wifi connection the whole night - that's gonna use power... its impossible that it wouldn't be actively consuming power.



You can go into your data usage settings and start restricting background data on your aps. For example "Shazam" has no business using background data, so disable it, as well as all apps you think don't require it. However don't think this will really solve your problem as the power is being used to keep wifi connected.



Hope that helps