Naoki,

I have always professed that tolumnias are like that - they originate on tiny twigs of shrubs on the windward side of Caribbean islands, where they get a nice rain, followed by a gentle, warm, blow-dry.

And then Eric Sauer showed me a lovely specimen growing in semi-hydroponic culture....

As to the winter rest, I'm too busy to cater to any particular plant, so my comments are based upon the experience of others, with my speculation as to why - wet or dry - it works.