Many/All users are reporting the loss of deep sleep after root and twrp.
You can check to see if your device is going into deep sleep by installing CPUspy.
Open CPUspy once and then leave your phone in standby for five to ten minutes.
Open CPUspy back up and see if you have anything showing in the deep sleep section. Any percentage means you have deep sleep. Blank means you do not.
You need to flash your Stock recovery.img
You can use an app like Flashify or use Odin.
You can get your stock recovery by downloading your Stock ROM from one of the links below.
Once you have the ROM in .rar you can extract it like any zip file.
Then you'll have a .tar file. Extract that the same way once more and you'll have folders. The recovery.img is inside.
For Flashify: Transfer the recovery.img to your phone somewhere. Open Flashify and install.
You should now have deep sleep.
Leave your phone in standby for a bit and then check CPUspy again to confirm.
You should only need to do this once after installing twrp. Then you can go nuts with ROM's and still have deep sleep.
It needs to be in this sequence:
root > twrp > rom/nothing > stock recovery > twrp again > then nothing or install your new ROM and you shouldn't need to worry about it again.