Do you want to ask if it is good to use full blackout curtains on the top floor? It is better to use full blackout curtains on the top floor.
If you want to sleep in a dark room, full shading is beneficial. If you don’t think it is necessary, half shading is fine, depending on your needs.
Fully blackout curtains should be good for video rooms and bedrooms. It not only blocks light but also protects the color quality of curtains. For full blackout curtains, it is recommended to use curtains with a refractive index of 80. A room that is too dark is not good for your health.