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I searched our site and was not able to find one answer to this question. As issues vary from person to person, the numbers of studies may as well. I was able to find a few items focused on testing and diagnosis. As well, not knowing your issue - insomnia, sleep apnea, etc. - I've provided various links to our material.
Diagnosis of Insomnia
Diagnosis of Sleep Apnea
Diagnosis of Narcolepsy
Hope this helps and all the best, sue