get yourself a seedling mat/waterproof heating pad. that would keep the
babies a bit warmer.

the thing i've most often heard is to expose them to the ambient humidity
until they wilt a bit, then put them back in their extra humid place again.
lather rinse and repeat. each time it should be a little longer before you
have to put them back, and eventually they should be able to take the usual
humidity you have.

of course i am in no way an expert, just thought i'd share some tips i've
heard from others.

--mo--