Never seen that issue before, but no wonder it woke you up!!!

Unfortunately we have had instructions from upon high that under no circumstances are we to disable the First lighting. There were problems early on with random lights coming on mid-flight and the temporary fix was to kill all the cabin lights until engineering could have a look.

However if we do this we have been told that in the event of a decompression the cabin will remain in darkness, hence no killing the lights.