Which position involves laying on one's side?

Sim's position specifically involves laying on one's side, typically with one leg drawn up towards the chest. This position is commonly used in various medical settings, such as during examinations or for certain procedures, as it allows for easier access to the rectal area and promotes comfort for the patient. It can also facilitate drainage when necessary.

In contrast, the supine position involves lying flat on the back, while the Fowler's position involves sitting up at an angle, and the prone position has the individual lying face down. Understanding these distinctions helps clarify why Sim's position is the correct choice for laying on the side.