I think it was a bad dream
Had this once. I shouldn't think it'll happen regularly. Maybe with the change of routine (ie someone coming in or being in during the day) it disturbed her sleep and she had a nightmare. I once heard a terrible loud squeak from our last hammy's house! I think it was the same thing - he also came out looking fine. I had put some hay in though and wondered if he had spiked his eye or something so haven't used it since! I think it's more likely a bad dream though. Probably dreaming about being chased by cats or something! You don't have a cat do you
?