I've read that it's best not to put apps to sleep or they won't receive notifications or updates. I went into settings and selected that option NOT to put apps to sleep. Then I go about my beeswax thinking things are good and fine. (fa-la-la-la-laaa) Next thing you know I pop into the sleeping apps folder (curiosity) and there are like 10 apps in there sleeping and I'm like WTF!?! I ticked the Do Not Sleep setting!!