Lewis & Short

in-dormĭo, īvi, ītum, 4, v. n., to sleep or fall asleep at, on, or over a thing; constr. with dat., with in, or with abl. (class. only in the trop. signif.).

  1. I. Lit.: congestis undique saccis Indormis, Hor. S. 1, 1, 71: unctis cubilibus, id. Epod. 5, 69: alienis amplexibus, Petr. 79.
    1. B. Transf., to be asleep, i. e. to be numb, torpid, of a limb, Veg. Vet. 3, 23, 15; 5, 46, 2.
  2. II. Trop., to go to sleep over a thing, i. e. to do it negligently, be careless about.
          1. (α) With in: in isto homine colendo tam indormivi diu, Cic. Q. Fr. 2, 15, 2.
          2. (β) With dat.: tantae causae, id. Phil. 2, 12, 30: longae desidiae, Plin. Ep. 1, 2, 3: malis, heedless, regardless of, Curt. 6, 10, 6.