Blurry contact lenses and excess secretions

I have posted elsewhere in this newsgroup about problems I have been
experiencing with occasional blurred vision in my new contact lenses
(I am a first-time wearer or Acuvue 2 and Biomedics 55 lenses). Dr.
Judy put an idea into my head--that coatings on lenses can be one
possible cause of this blurring. On the few occasions that I have
slept in my lenses, about 40% of the time, I wake up with one lens or
the other so blurry that I can't see out of it, and it gets better
after I clean it, so I assume that it is getting coated with something
as I sleep. I have extremely oily skin and have been diagnosed with
seborrheic dermatitis (with flaky deposits of sebum appearing quite
often on my scalp and face), and I am wondering if this could be in
any way related to an abnormal secretion of the lipids in my tears, or
an oily secretion of something else that is coating my lenses. Is
there any way to test this idea? Can anything be done so that I can
keep wearing lenses, if this is the problem?

The other ideas that have been suggested to me as possible causes for
my symptoms are dry eyes (it's possible I don't blink enough), and
changes to my cornea resulting from lens wearing.

Lothar