It is abnormal for a dog to not sleep for a long time. If it only lasts for one day, it is likely that the sleep time during the day has been enough. At night, the owner has returned home, so the dog will be more playful and prone to symptoms. Not sleeping. It may also be that a stranger has entered the home and it is more wary, so it rarely sleeps. However, if it is not sleeping for a long time, accompanied by loss of energy and appetite, and moaning, it is very likely that the dog is injured or sick, and may not be able to sleep due to pain. The specific results still need to be taken care of by the owner. Only if you hold your dog and go to the hospital for a check-up will you know.