Noun

1. The gum that builds up in the eye.
   • 1964, Ken Kesey, Sometimes a great notion

     "Did he always leave the sleepy in his eyes?" "Never removed it; let it build up in the comers of his eyes over the weeks until it was heavy enough to fall...

   • 1991, Martin Amis, London fields

     But the nightdress was heavy, the sleepy in her eyes was heavy, her hair (she made a mustache of one of its locks) was heavy and smelled of cigarettes...