Can sheer curtains block sunlight?
Sheer curtains are designed primarily to let natural light into a room while offering some privacy, but they do not block sunlight entirely. These curtains, whether they're sheer curtains for the living room, sheer window curtains, or sheer bedroom curtains, gently filter the sunlight, creating a soft, diffused glow throughout the space. This makes them ideal for areas where you want a bright, airy feel without the harshness of direct sunlight.
For example, sheer white curtains are perfect for brightening up a room, as they allow sunlight to pour in while still maintaining a level of privacy. However, if you’re looking to block out more sunlight, sheer curtains won't be enough on their own. In this case, pairing sheer curtains with blackout curtains or thick drapes is a great option. Sheer curtains, especially long sheer curtains, are also an elegant way to let in light while adding a sophisticated look to your space.
If you're looking for a solution that balances both light control and privacy, custom sheer curtains allow you to choose the fabric and design that best suit your needs. 

https://thecomfymart.com/sheer-curtains