Erectile disfunction due to booze

Last night I failed to get an erection.  I had been drinking heavily so I put it down to that.  But the this morning I failed to maintain an erection (got hard but didn't last long), could I still be suffering from 'brewer's droop' the next morning?

Usually I have the opposite problem, it's almost embarrassing how hard I get so early.  Just kissing or a bit of physical contact can get me going so I'm a bit worried about it happening the morning after.

Thanks