To test this, Bmal1‐iKO and control mice were treated with lipopolysaccharide plus midazolam (named LM treatment) to induce delirium.[20] In comparison with control mice, Bmal1‐iKO mice showed an increased susceptibility to developing delirium as evidenced by a lower discrimination index (between the novel and familiar object) and fewer spontaneous alternations (Figure S2N,O, Supporting Information). Here, BMAL1 is linked to delirium.