i have had a sleep study done for sleep apnea currently awaiting the results, i answered some questions on how likely i was to fall asleep in certain circumstances etc because i scored high they sent me to the chest clinic, they gave me a machine that i had to take home for one night, all it was, was a clip on my finger it measured my heart rate & blood oxygen levels while i slept they can then tell wether i have it or not, it may not be the same thing as i had as i am from England and they do things differently everywhere.
Lainie

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