I meant to say that within one episode in one person there can be both depressive hypersomnia and, in turn, early awakening. I used that phenomenon to illustrate the complexity of this illness.

To OP: http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1449201/ a scholarly US result concluding that in young adults abstinence and moderate alcohol use produce the same outcomes with respect to incidence of depression. Caution: this is a study of general population of young adults.