Lewis & Short

somnĭo, āvi, ātum, 1, v. a. (dep. collat. form: hic aedes non somniatur, Petr. 74, 14) [somnium], to dream; to dream of or see in a dream (freq. and class.).

  1. I. Lit.: mirum atque inscitum somniavi somnium, Plaut. Rud. 3, 1, 5; so, somnium, id. Mil. 2, 4, 28; 2, 4, 47: aliquid (in somnis), id. Rud. 3, 4, 68; id. Curc. 2, 1, 32; 2, 2, 4; Ter. And. 5, 6, 7; Cic. Div. 2, 59, 121 al.; cf. aurum, Plaut. Stich. 5, 2, 18: ovum, Cic. Div. 2, 65, 134: speciem fortunae querentis, Suet. Galb. 18 al.; cf.: me somnies, me exspectes, de me cogites, Ter. Eun. 1, 2, 114.
    With obj.-clause: videbar somniare med ego esse mortuum, Enn. ap. Cic. Ac. 2, 16, 51 (Epich. v. 1, p. 167 Vahl.); Plaut. Mil. 2, 4, 39; Cic. Div. 1, 20, 39; 2, 65, 134 init.; Suet. Aug. 91; 94; id. Claud. 37 al.
    With de: hanc credo causam de illo somniandi fuisse, Cic. Div. 2, 67, 140: puer, de quo somniasset, Suet. Aug. 94.
    Absol.: totas noctes somniamus, Cic. Div. 2, 59, 121; id. Ac. 2, 16, 51; Plin. 10, 75, 98, § 211; Suet. Ner. 46 al.
    Impers. pass.: Aristoteles et Fabianus plurimum somniari circa ver et auctumnum tradunt, Plin. 28, 4, 14, § 54.
  2. II. Transf., as in Engl. to dream, i. e. to think idly or vainly, to talk foolishly: eho, quae tu somnias! Hic homo non sanus est, what are you dreaming about? Plaut. Merc. 5, 2, 109: quos Summanos somnias? id. Curc. 4, 3, 14: de Lanuvino Phameae erravi; Trojanum somniabam, Cic. Att. 9, 13, 6: ineptias, Col. 1, 8, 2: ah stulte! tu de Psaltriā me somnias Agere, Ter. Ad. 4, 7, 6; Plaut. Pers. 2, 3, 5.
    Absol.: vigilans somniat, Plaut. Am. 2, 2, 65; id. Capt. 4, 2, 68: portenta non disserentium philosophorum sed somniantium, Cic. N. D. 1, 8, 18.