graduate admissions - Should medical conditions that affected performance be stated in personal/research statement? And how?

Condition

I have been suffering from day time sleepiness (9-10 hrs of sleep and still struggle to stay awake), fatigue, memory loss and lack of concentration. The doctor found that I suffocate in my sleep: I stop breathing several times per hour.

In a few days, I will be undergoing surgery to modify my airway (nose, throat) that, according to the doctor, will completely resolve these problems.

Background

My profile is OK: undergrad valedictorian, scholarships, awards, numerous research experiences and skills. But my condition was exacerbated during the masters and I graduated "B+" instead of continuing my straight "A" performance during undergrad. Also, I felt that I could have performed better in standardized tests (GREs), do more research etc without my condition.

Questions

1. 
   

   Should I make this medical condition known in my research/personal statement? I fear the reader might assume that I am not as "able" as completely healthy candidates. Or perhaps there is no benefits at all to bringing this up?

   
   


2. 
   

   If so, how should I put it to avoid sounding like I am making excuses or whining?

   
   

Answer

Should I make this medical condition known in my research/personal statement? I fear the reader might assume that I am not as "able" as completely healthy candidates. Or perhaps there is no benefits at all to bringing this up? If so, how should I put it to avoid sounding like I am making excuses or whining?

If you can frame this medical condition as a situation you have learned to work through and around, then yes you can talk about it. It makes you sound like you are able to adapt to difficult circumstances. You are under no requirement to bring it up, and, at least in the US, if you don't bring it up, then you cannot legally be judged based on it.

However, if the condition reasonably or seriously will interfere with the work you are planning to do, then you need to disclose it eventually, although perhaps only after you are accepted and only to your research adviser. Sleepiness is one thing, but what about narcolepsy? A narcoleptic might be a safety hazard in a synthetic chemistry lab for example.