I have had that problem in the past, and it always happened when I was in the middle of a flare. I don't know why it happens, though. I usually get a prescription from my rheumy to help me sleep when I go through that. He doesn't give me a sleeping pill, though, but a low dose muscle relaxer that I won't get dependant on. It helps a lot, and when my flare passes I go back to my usual sleeping habits.
dix: lupus sle Jan. '99, hypo-thyroid Mar. '06
rx: pred. 5mg/day, plaquenil 200mg/day, levothyroxine .112mg/day, premarin .45mg/day, methotrexate 7.5mg/week, folic acid 1mg/day
wife, mother of three