My tab a with book cover closed uses almost no battery. My s5e with the screen switched off uses half the battery overnight. Is there a better sleep mode?
did you check your settings to see if there is anything using the battery when it is supposed to be in sleep mode? I do not have that problem with my s5e. but to answer your question, I don't know of any apps that will replace sleep mode. I did a quick search and did not see any.