Good way to block light in a dorm room?

So I’m going to be an incoming freshman living in Hobby Hall and I’m kind of worried about keeping my roommate up. I’m planning to bring my pc to college and as such I’ll have a monitor on my desk, and even if I don’t take my pc I’ll probably still take my monitor because I don’t wanna be working on my little 15” laptop when I could use a 27” monitor.

I’m mainly just worried about the light keeping him up because I kind of tend to work until late at night, so do you guys have any ideas for how I could block out that light?