To keep your bedroom dark, you need light blocking curtains. Furthermore, a good quality curtain can even block noises from outside.
I’d recommend for both purposes Sleep Well blackout curtains. Thick fabric can ensure sound insulation and light darkness at the same time!
When you are looking for real cheap blackout curtains for your bedroom, you may want to buy this set of curtains. These curtains will block most of the sunlight to your bedroom.
Check out those curtains, and see which is a good option for you!