There may be someone who is interested in SoftLocker. When it's enabled, it prevents the device from sleeping, but the screen can be turned off. When you disable it, the device goes to sleep as it normally would. Because it's something you control, you can be certain that the WiFi stays connected, since changing the WiFI Sleep Policy doesn't work for some.
http://www.appbrain.com/app/softlocker/otis8.softlocker
Some might say, "Who wants their WiFi on all of the time?" If you're someone who wants/needs to receive notifications throughout the day and/or you want feeds, etc. updated continously, then this is for you.
At the end of the day, you can disable SoftLocker and allow your device to sleep overnight.