I restart mine when I get on airplanes...
i'm the same as Wicked1, i don't want calls, etc when i'm sleeping, so i shut it off at night and turning on in the morning when i wake up 🙂
My 3g only gets a restart when I forget to charge it and the battery dies
I often go weeks without restarting.
I always thought that was what Airplane Mode was for.
That's what the silent switch is for...
only after I do lots of app downloading and internet browsing.