So just like you would soundproof your room if you wanted to dampen the sound what are some good complete block out options for the light. Think tinted windows for cars. As always cheapest best option is best don't wanna spend more than $200 on this if possible.
Dimension of the Windows are approximately 245cm x 145cm.
Pity you specified curtains, or I'd suggest a spray can of black paint. :)
I bought some heavy curtains from Freedom Furniture a long time ago but that was a sale. A more recent set came from Ikea. I think it was under $100. You'll also need the rod and mount, and somebody to fit them.