If no sunrise and if no sunset.

I think if there is no sun, no living things will live and life. For your second suggestion, I can imagine how eskimos people having their daylight for 6 months and night for 6 months. For this situation, I think its OK and we can enjoy with normal life. But the power energy will fully utilized from the sunlight and will no need to have hydro-power station or diesel power station. Less bill for our internet usage!!!!

Good question! Personally, I love the dark! If there was no sun, I'd be totally happy to live by candle-light - darkness is so romantic! It's also so much more relaxed and cozy than light! I feel uncomfortable in bright light, so if there was no sunset, life would be hell for me! I feel like I really come to life when the sun goes down, so I love it in the Winter when it gets dark at 4pm! Daylight is far too imposing and harsh for my liking! :D