Your research on various medical conditions that can deprive sleep was very interesting. I like how you started your research by busting a myth about insomnia. I find that some conditions that make sleeping difficult are often misunderstood and characterised solely due to this symptom, making it difficult to identify the actual issue. It is also interesting how the effects of some conditions can be reduced by a simple lifestyle change, while others cannot be cured.
One thing that perhaps you could look into if Fatal familial insomnia, which is a variation of insomnia that is extremely progressive and can result in death. Although it is extremely uncommon, it would probably still be interesting to research. Here is a link with some information about it.
I hope that this helps and good luck with your research!