Is There a Way to Sleep Better?

For those of us living in northern climates, the sun is setting now. What can we do to make sure that we are getting the sunlight that will help us ultimately sleep better? I've heard comments about, well, if you live in new york city and you've got all these high rised buildings,. Ah, or if you just don't get as much sunlight, you just have to be out there longer - unfortunately.