You might need to write a different request letter to ask someone who you should write to. In this case, still follow these steps for writing a request letter. Learn the format for a business letter. Your request letter should use the proper business letter format, as it is likely a formal request.
The Epworth Sleepiness Scale (ESS) is a scale intended to measure daytime sleepiness that is measured by use of a very short questionnaire. This can be helpful in diagnosing sleep disorders. It was introduced in 1991 by Dr Murray Johns of Epworth Hospital in Melbourne, Australia.
The severity of sleep apnea is determined using the AHI or Apnea/Hypopnea Index, also referred to as the RDI or Respiratory Distress Index. This is the total number of apneas plus the total number of hypopneas, divided by the length of the sleep period.