I wanted to put a cookbook together on how to get your PDN into deep sleep and keep it sleeping overnight. Doing this may require you disable or remove some of your apps and make others not as convenient to use by turning off automatic update options. If you don't think saving power is worth it don't attempt these instructions.Let me know the results... I'd like to try to get this so it works for most people.The first thing you will need is a good reliable tool to examine your system that does not depend on background monitors or services. There are likely many of these available. The one I use I know works so lets begin:1. Download and install "system panel". The lite version from the marketplace is good enough. If you don't have marketplace google around for the apk. Try including androidsoft4u.2. Reboot your system to start off with a clean system.3. In settingsa. Under "wireless and networks" turn off wifib. Under "Sound and display" select the last item.. "screen timeout"... select a smallish value like 2 minutes.b. Under "Location and security" turn off "use wireless networks" and "use gps satellites"c. Under "accounts and sync" turn off "Background data"d. Under "privacy" turn off "use my location" and "back up my settings"4. Run system panel app. the default first page shows active tasks and inactive tasks. The inactive ones don't matter. But the only active task you want is system panel. I also have "better keyboard" app showing here which I know allows deep sleep. But if you have any task monitors or email clients or google stuff here.. Kill them one by one. Press the task and on the next page select the kill button.5. Kill off any services you have running.. Under "settings - applications settings" select "running services". The only one I have is better keyboard which I know allows deep sleep. Anything else should be suspect. GTalk loves to hang out here if you have GE installed. Kill them all...6. Some apps have options for automatic checking of something... for example email programs might check for new email every hour. If you have any apps like this installed turn off the automatic checks. This might be email clients, instant messaging programs, news programs, social networking programs, task killers, etc.7. Select "spare parts - battery history". Check "other usage" on first box and "since last unplugged" on second box. Press the "running" bar.. Copy down how many minutes was spent without sleep.8. Check using system panel one more time for active tasks. Kill any that snuck back in. And exit the system panel.9. Be sure you are at the homescreen.10. FINALLY TURN OFF YOUR SYSTEM.. using the power switch.11. Wait 10 minutes 12. Turn on your PDN13. Check the running time again from step 7... It should be the same as when you turned it off. This is deep sleep.If your system went into deep sleep you can go back to step 8 and wait longer. Unless you installed GE you should be able to wait as long as you want within reason... THere is still small power drainage.. I suspect you could leave the system with a full charge in this state for more than a week or so. But I have not played with this at all.If you have GE installed and you intend to let the system sleep more than 30 minutes you need to replace step 10 with:10. Wait for the "screen timeout" to turn off the system.