'To sleep away' definitions:

Definition of 'To sleep away'

From: GCIDE

Sleep \Sleep\, v. t.
1. To be slumbering in; -- followed by a cognate object; as, to sleep a dreamless sleep. --Tennyson. [1913 Webster]
2. To give sleep to; to furnish with accomodations for sleeping; to lodge. [R.] --Blackw. Mag. [1913 Webster]
To sleep away, to spend in sleep; as, to sleep away precious time.
To sleep off, to become free from by sleep; as, to sleep off drunkeness or fatigue. [1913 Webster]