Nano 6G Sleep Timer: Where's the Manual?

I would like complete, concise directions on how to use the sleep timer (not the 36 hour sleep battery saver feature) conveniently (click on and off while in the music menus) while listening to music. Does Apple provide a complete manual for this product? The "manual" I found didn't have much information. Why can't software/hardware companies write manuals anymore? People are helpful on the forums, but the information ends up being fragmented, hard to search, difficult to date, & hard to pin down to a device version, etc.