I recall reading that during the Viet-Nam war some Navy pilots were wired up to a stress monitor. There was hardly a blip during combat over North Viet-Nam, BUT the stress levels went off the charts during night landings.
I don't doubt it. Check out this cockpit video of a night landing. There is no horizon, nothing for a reference point, just some lights and your instruments. http://images.military.com/Video/050721_NightTrap.wmv