When most people think of the concept "sleeping," they also tend to think about concepts like "dreaming," "being tired," and "yawning." that is, when they think about "sleeping," related concepts are

primed

Explanation:

When a stimulus is primed then this stimulus influence the response of subsequent stimulus. This may be guided or intentional. For example when someone says the word food, you think about eating, types of dishes, cuisines and so on.

The best results can be achieved when the stimulus have similar modality. Modality is the way by which information is encoded.

there are no options provided but you can choose among the following gender-neutral pronouns: zir, hir, eir, vis, tem, eir.

in the normal course of maintaining a pronoun-antecedent agreement, we could have used the words his or her but since we are also required to use gender-neutral language, we need to replace it with its equivalent gender-neutral pronoun.