One's drunk, awake: knowing one should drink less? (6-9)
I believe the answer is:
Here is my best explanation:
'knowing one should drink less?' is the definition.
'one's drunk awake' is the wordplay.
'one's drunk' becomes 'health' (ref to 'drinking someone's health' in a toast).
'awake' becomes 'conscious' ('conscious' can be similar in meaning to 'awake').