The stork brought a pair of newcomers to our house - my sister gave birth to twins! It was the height of summer and we were anxious about doing up the nursery in such a way as to block out as much light as possible. Grandfather with hours of researching on the net told me that Blackout Blinds are the best choice. These are either patterned blinds on a black surface or linings that can be attached on to curtains. The black out kits are most convenient and cheap. Black out material can be fixed with self-fixing Velcro. It can be easily removed. The idea caught on and many night-shift workers or light-sleepers have taken down the details from me.