What is the most interesting syndrome you have learnt about

Question: What is the most interesting syndrome you have learnt about
- Keywords:
  interesting,
  syndrome
Asked by ps_no1 to Hayley on 18 Mar 2016.
- Hayley Moulding answered on 18 Mar 2016:
  
  A thing called Smith-Magenis Syndrome. These children have a gene missing which controls how they see light and how light controls how they sleep. Basically, there is a gene missing which controls how light releases different chemicals in the body. Without this gene, they find it hard to sleep and around 97% of them can’t sleep properly.

Question: What is the most interesting syndrome you have learnt about