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You need to keep him very quiet and calm for a while. Put him in a dark room with no noise and leave him to calm. Have food and water available. Check after 3 hrs. If your hamster appears worse then you need to see a vet and have him checked over. Try and keep him quiet and calm for a good while now to settle as he has had a bad fright. You have been luck and you must ensure you secure the cage everytime now.