There are a number of window treatment solutions to consider when looking to make your room as dark as possible. Where and how the treatment is fitted, the colour of the treatment and the thickness of it.

Curtains
Select a fabric that has a nice heavy feel to it and where possible darker colours will help eliminate slightly more light than a lighter colour of the same material. Make sure you request a blockout lining when ordering your curtains. When it comes to track and rod selection a face fit track that does not use brackets will give you a better seal and eliminate the halo effect where light creeps through the gap between the curtain and the wall at the top as seen in the photo opposite. If you have a pelmet this should not be an issue.

Roman Blinds
Roman blinds sit flush against the wall so inherently provide a good block of light. Ideally suited to windows with a drop of around 1.6m often found in bedrooms. Again as with the curtains selecting a darker thicker fabric with a blockout lining will ensure the best possible outcome.

It may be wise to ask for a slightly wider roman blind than standard to create the best possible seal.

Honeycomb Blinds
Blockout Honeycomb blinds create a great light seal given their tight fit inside the reveal of the window. They are an excellent option if you are looking to eliminate light entering your room but prefer a more discreet appearance when open during the day time.

Shutters
Given that they are generally made from solid wood or a composite material combined with the addition of light stops make shutters one of the best solutions for light control out of all the window treatments. With the ability to tilt the slats for differing levels of light control they increase the functionality when compared to other window treatment options that are either open or shut.