Have you tried a blood test yet. I would recommend this along with a sleep study in the least.Went and saw a sleep specialist yesterday.
With my anxiety I've always had a side effect of debilitating fatigue and lack of motivation to be able to do things. At times it gets so bad I can't even be bothered brushing my teeth before bed because I just want to sleep.
Looking into sleep apnoea as expected, but he seems to think there's more there.
He's actually suggesting I may have a form of narcolepsy.
Didn't think it would go this far!