Maybe somebody can quote me this since scepti has taken it upon himself to block me.
"A common misconception is that the polar shortest day is totally dark everywhere inside the polar circle. In places very close to the poles it is completely dark, but regions located at the inner border of the polar circles experience polar twilight instead of polar night. In fact, polar regions typically get more twilight throughout the year than equatorial regions.
For regions inside the polar circles, the maximum lengths of the time that the sun is completely below the horizon varies from about 20 hours at the Arctic Circle and Antarctic Circle to 179 days at the Poles. However, not all this time is classified as polar night, since sunlight may be visible because of refraction. Also, the time when the sun is above the horizon at the poles is 186 days. The numerical asymmetry occurs because the time when the sun is partially above the horizon is counted towards the "daytime". Also, the above numbers are average numbers: owing to the ellipticity of the Earth's orbit, where the South pole receives a week more of sun-below-horizon than the North pole."
So the number of consecutive polar nights and polar days is almost symmetric but because of the elliptical orbit this slightly varies by as much as 10 ten days.