Too Bright Invisible Lightsource at Night in Helicopters/Aircraft Cockpit

Same here. Every aircraft I fly has this bright light. It is somewhere inside the aircraft, not necessarily the cockpit. When I fly the P-51 it is somewhere in front of the firewall and the engire engine is illuminated from the inside. In other aircraft it is inside the plane somewhere and the cockpit (with no flashlight on, and the battery master is not on) has a huge, bright glare shining back into my face.