@db2 We haven't yet implemented a full "sleep" solution. PocketCHIP is shipping with a "sleep" feature in the UI, but it consists only of turning the screen backlight off (which is huge savings!). With the backlight off you can get decent uptimes, not quite like your phone, but in the 10-12 hour range doing light/occasional CPU work, with the radios on.
We're working on it, but I don't have an estimate on when more full featured "sleep" comes to PocketCHIP and CHIP.
If you have any knowledge about this, we'd love to hear it.