The first morning glory seedling came up today! It's been a while, and there's no sign of any others. The bathroom windowsill where I'm trying to grow them is fairly cool so I don't think the rest are going to germinate just yet. I'm going to add a few more and try again on the bedroom ledge which is much closer to the windowsill, should provide more bottom heat.
Funny that they come up with the seed coat still attached to the cotyledons! Reminds me of trying to get a sleeping bag into/out of a compression sac haha :) I'm so impatient to see the leaves (and eventually flowers)!!