I think sleep studies are commonly ordered for people with chronic fatigue, especially if the cause is unknown. I have read of a number of MS patients who had them as well as many Lyme patients. My neuro suggested a sleep study for me at one point.
My brother in law was having trouble staying awake during the day and was sleepy and yawning most of the time. A sleep study showed he had bad sleep apnea and a c-pap machine resolved his sleepiness. But the fatigue I had with Lyme was different. It was a crummy feeling of little energy and less motivation, like I was coming down with the flu, but then never did. Small doses of Ambien helped me sleep more, which reduced my severe fatigue, but not much.
A sleep study could be really helpful if it shows something treatable. I didn't have one, but my neuro prescribed provigil for me anyway. It helped cut the fatigue and improve my mental clarity a bit. I am still taking a small dose a year later.
I've never had a sleep study but please be assured that I and many others will be lifting you in prayer and I do hope that it will also help further help with answers and help w/ MS sx's.
Let us know what you find out!
Hugs and blessings,
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