Logging Accelerator Events

[Konabob]

I am looking for an app that will keep a log of when I move during sleep as detected by the Accelerator, perhaps with the ability to set the sensitivity to low, medium, and high. It should be easy, but I can't find an app that does this. There are sleep monitors, but as far as I can tell, none of them do this one simple thing. Many of the apps on Market do all kind of tricks, including alarm clocks, and many reportedly overheat your phone.
An app like this would be useful for detecting sleep apnia.

If you know of such an app, please let me know.
Aloha,
-Konabob