Bluetooth timeout?

[friguy3]

I have noticed sometimes, i always leave bluetooth on, that i go to put on my headset or gps and it wont connect, then i go check and my bluetooth is either off, or it says its on, but when i click it i changes to off like the icon was faked out and then turns on. does the bluetooth go into sleep mode or have some kind of power save feature were it turns off if not connected in say an hour? thanks!