My dog woke up suddenly last night and was panicked. She could not stop moving. She moved her head from side to side, jumped on and off the bed. was panting, licking, she just could not stop. It was like she was scared or anxious. she could not calm down or stop. She would come to us but could not stop moving. This lasted for 4 to 5 hours. She slowly calmed down and fell asleep. She seems fine today, just tired and probably sore muscles. This has happened 2 or 3 times over a 3 year period.