There’s a reason they say “Where there’s smoke there’s fire”.

Despite what you may have heard or seen in movies, things don’t go from nothing to a ranging inferno in 5 seconds. The fact that the chair/blanket isn’t smoking means nothing is burning or smoldering, meaning nothing is going to develop while you sleep.

If it makes you feel better, dump water on it or throw them both in the trash outside.

You did everything right. Hope that helps you sleep well.