It has been raining all day today, and too cold to put the plants in the sunroom. At this time of year, if the sun isn't shining, the temperature in the sunroom is only a degree or two above the outside temperature. So in the interests of giving my plants some light but not freezing them, I took them downstairs this afternoon out of the dark hall.
It's maybe been an hour and a half, two hours since I did that, and all of the seedlings are bent at nearly 90 degree angles trying to climb out the windows. Even without the sun actually shining. It's quite impressive. I'll leave them down there until next week, because unfortunately it looks to be both cloudy and cold for the foreseeable meteorological future.