Dictionary — ontologydriven

sleep like a dog en · VERB

(qualifier:simile) Synonym of sleep like a log.
- Skookum Bill, full of restless, tireless energy when on the trail, now passed to the other extreme. He slept like a dog, sixteen hours a day, rising to eat and smoke, and then falling back in his bunk, where he coiled himself very much like a hibernating bear. He was stupid with sleep, drugged with it, and he did absolutely nothing, leaving all the work to his partner. 1922, A. M. Chisholm, A Thousand a Plate:

Spelling	Features	Source
sleeps like a dog	Number=Sing, Person=3, Tense=Pres	lexicographic
sleeping like a dog	Tense=Pres, VerbForm=Part	lexicographic
slept like a dog	Tense=Past, VerbForm=Part	lexicographic
slept like a dog	Tense=Past	lexicographic