You think something's wrong--you're wrong. Nothing's the matter, it's simply a quiet part of the woods. But your worrying keeps you up all night, and you lose sleep and energy.

You didn't dismiss it--Nothing changes.

After a sleepless night of walking, both you and your horse are exhausted. The next day, you can't get the creature to move at all, since your horse keeps falling asleep. You lose more time.