Several companies have been putting their name on this laptop stand, which allows you to use your laptop while laying on your back in bed.
The angle of the laptop can be adjusted over a wide range, but the height of the laptop can only be adjusted over a short (2 inch?) range. At least one owner has also labeled it as being a bit fragile. The upside is it's quite cheap, and portable. Find it for about $45 on amazon (shipping included). Some specs. A demo video.
Without having tried it, I should reserve judgement, but this doesn't look like a great solution to me.
This post is part of a series summarizing the various laptop stands that can be used in bed.