The best way I found to block out light is with room darkening cellular shades that are properly fitted. This will that care of 99 % of the light. Then panels along the sides for the light seeping thru and a top treatment. The below article covers this very topic.

Here is a link that might be useful: Its midnight anytime you want with these cellular shades

How about a cornice board on top? That should keep the light out at the top.

I suffered from migraines for twenty five years so I had to have a very dark bedroom. I learned that no matter what I did there was always a touch a light streaming in right in my face. I started wearing a sleep mask. Works like a dream and I can have beautiful windows without all the hassle.
It's good to see you back Susan.

terriks - ooh, I'm not very familiar with those. I'll go look for some pictures. Thanks.

justgotabme - thanks for the welcome. I can't do the sleep masks. I can't seem to sleep with them on.

Here are a few pictures of cornices:

{{!gwi}}

Actually, any top treatment that is mounted to a board will work.

terriks - thanks so much for posting the pictures. My window guy is coming tomorrow and now I have a much better idea of what to ask him

I wonder if it's weird to have a non-descript cornice behind the draperies? The cornice look itself isn't getting me all excited but I need the functionality of one.

Thanks again.