I've always had some sort of sleeping issue, and in college it gets harder when you aren't exactly in the best environment and aren't sleeping on the top choice mattress. Back home, I don't always sleep well, and it usually takes me about an hour and a half, sometimes longer, to fall asleep. This has been an ongoing issue ever since I can remember, and it's taken me 19 years to figure out a better way to fall asleep.
In my room back home, I don't have an air conditioner, my bed is a weird shape so my sheets tend to slide off (I'm extremely OCD about making sure they're tucked in every time I get in again), and there's a dip right in the middle of the mattress where I've been sleeping for the past 6 or so years. At home, I have a horrible time sleeping, and there have been many times that I have stressed myself out about it and end up making it worse.
Freshman year I still had some sleep issues, since I essentially had the same environment in my dorm as I had in my house (minus the mattress dip). This year, however, I think I've finally figured out how to get a good night's sleep!
My dorm apartment has air conditioners in every room, so I can adjust the temperature where it's comfortable. I have 3 mattress toppers to go over the horrible dorm mattress the school uses (this is the one I find most comfortable), and although the sun streams in since there are lights right outside my window, I get to sleep pretty quick without tossing or turning.
What I think is key is comfort, and more importantly temperature. I tend to get really hot when I'm sleeping, and the air conditioner is my favorite part of my room now. I think the right mattress topper also helps to relieve stress from my muscles (I have issues with both my back and my shoulders) and makes me relax into a comfortable state.
For those of you heading off to college, or are just having trouble sleeping wherever you are, I suggest looking into getting a heating/cooling unit for your room (or a decent fan if you don't want to spend a lot), and a comfier mattress or mattress pad. It truly makes a huge difference!!