Activity Prevented by PsA

PsA debiitating fatigue prevents me from attending social activities and makes it difficult to work. Several times per year I sleep 20 + hours/day then each day I sleep less and less until I'm back to my normal 9-10 hours sleep/night. I have yet to identify any trigger for this "sleep coma." I take narcolepsy medicine (Nuvigil) everyday to reduce the debilitating daily fatigue. Nuvigil helps immensely.