In this pose, the bird can even sleep.

Why do herons stand on one leg? There are several reasons for such behavior.
Firstly, this way the heron reduces heat loss. By tucking one leg under its plumage, it reduces the body surface area through which energy escapes. Secondly, it's simply comfortable for it. A special natural mechanism in the joints fixes the raised limb without muscular effort. Many wetland birds periodically switch their supporting leg while resting, Smartpress reports.
Ultimately, a heron can sleep on one leg or on two. Everything depends on the temperature, weather, and its own condition.
During sleep, the bird retracts its neck, hides its long beak in the feathers on its chest or under its wing, and maintains a stable position thanks to the special structure of its tendons and joints.
Muscles do not have to work constantly to support the body. Therefore, a heron can spend many hours in this position.
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