Interesting. Do E53s have window calibration too? I know newer models do. Mine had a broken front left regulator. The previous owner unplugged the harness. I installed a new regulator. Not know that I could have fixed the OEM for $20, I bought an aftermarket one. I kept the OEM regulator. Once the current one fails or I get annoyed with its speed, I'll fix the OEM and reinstall it. The no sleep issues started two months after we bough it.

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'06 X5 3.0i - bought @143,123 miles (12/26/20)