There are some questions that can be answered. Just FYI, I've only seen it once in my life, when I was visiting Norway, but others who live far north would be able to answer more completely. But generally:

1. It appears just like the sun always appears, except that it doesn't set. It dips down near the horizon, but rises again before getting below the horizon. Actually, you can get the same effect if you are on an airplane flying fairly far north, I think.

2. No, because it's daylight.

3. No, because it's daylight. There's nothing special about the midnight sun, except that the sun doesn't dip below the horizon before rising again. Hence, you don't have a "night" that day in the regular sense.

4. It depends where you are. You can do the experiment yourself with a globe and a light, but if you at the North Pole or South Pole, the sun only rises once a year. So it's daylight for 6 months, and then night for 6 months.

5. It's an interesting question. I wonder whether it disrupts their sleep in any way.

6. I'm pretty sure you only see Auroras at night, so you wouldn't see them on a day when the sun doesn't set. But otherwise, they are totally unrelated phenomenon, AFAIK. The midnight sun is due to the earth's tilt (the same reason we have summer and winter). The aurora is due to solar activity.

__________________
As above, so below