Yes, they can be a good option for a bedroom, and they are often recommended for this use. Here are a few reasons why:
Improved Sleep: Curtains room darkening can block a certain portion of light, which can be especially advantageous if you're light-sensitive and require daytime sleep or if your bedroom is exposed to external light sources such as streetlights.
Reducing Glare: If you have a television, computer, or other electronic devices in your bedroom, room-darkening curtains can help reduce glare on screens, making it easier to watch TV or work on your computer without the distraction of excessive light.