Placing electrodes in a sleeping wolf for electroencephalography (EEG) was another task, making such a study a reality was difficult. However, Hungarian scientists managed to do this on wolves bred among humans. The animals slept next to their caregivers and EEGs were performed on them. The same was done with dogs.
It turns out that wolves go through the same sleep stages as dogs. They differed only in the duration of the REM phase, that is, the phase of REM sleep. In wolves it was longer, and with the age of the animal the difference only intensifies.
Source: Ferra
