You are free in principle and a good deal less free at half past eleven at night in the middle of a row. Freedom is a capacity that rises and falls, which also means it can be built.

What the research says

The alcohol myopia account, set out in a review of this literature, holds that alcohol narrows attention onto the loudest provoking cue and away from the reasons to hold back, which is why intoxicated people act on anger they would otherwise contain. It is a theoretical review pulling experimental work together rather than a single study. It describes one particular state, and extending the same narrowing logic to tiredness or stress is a reasonable guess rather than a finding.

Strength of evidence: one line of research. A single study, or a theoretical account.