I tested this earlier today to get a screenshot, because I thought I had seen it before. I loaded into a remote clearing in northern Norway, time set to about midnight, cold & dark. I hid the EFB and looked around the cockpit with cabin lights off. I tried with the cabin door both open and closed. To my surprise, there was no light whatsoever, other than a couple pin-pricks of stars that didn't cast any light into the cockpit. No light around the door, no light in the cabin, no light in the cockpit. The only kind of odd thing is that all the gauges appeared kind of frosted while the rest of the cockpit was super dark.