Deer are primarily crepuscular animals, meaning they are most active during dawn and dusk rather than being strictly nocturnal. Many people ask, "Are deer nocturnal?" because they often see them grazing in the early morning or late evening. While they do venture out at night, especially in areas with heavy human activity, their main feeding times occur when light conditions are lower. This behavior helps them avoid predators while still searching for food. Overall, deer demonstrate a remarkable ability to adapt their activity patterns to their surroundings, allowing them to thrive in various environments.
https://litefacts.com/are-deer-nocturnal/