Dressing the windows is extremely important in the bedroom not only for privacy but to adjust light according to how and when you like to wake up.  Some prefer a blacked-out room while others like waking up with the sun.

curtains can be made with a maximum block-out backing which is designed to keep out the sun

sheer curtains are often used for bedroom window privacy during the day.   I prefer to use pure cotton instead of synthetic fibres to allow air to breeze through from the window

blinds can be used instead of or as well as curtaining for a different look but may allow light to filter between the blades and

around the edges

shutters allow light and air to be filtered at various angles and will retain natural air flow in the room