Did I miss if you reeplaced the FSU? It's the main cause of no sleep ; been there done that) the second most common is the telephone interface which is usually unused.

Pull the FSU (or fuse supplying it and the control hardware(, and see if your sleep works again.

When my FSU failed, it stopped running the blower. When wife's failed, it operated the blower fine just sucked the battery dead in three days when not driven.

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2011 E70 • N55 (me)
2012 E70 • N63 (wife)