When I put my N810 in my pocket I always lock the screen to keep it from turning the screen off. At night I leave it on but switch to offline so it doesn't continue to look for network connections. I have a neighbor with WiFi that's far enough away for the signal to drop and reacquire. The connection lost sound had wakened me a number of times. I charge every day until the N810 is fully charged. Less than two hours charge usually does it. Nokia discourages overcharging but as a rule lithium ion batters aren't subject to over charging in addition to not having a memory.