There are actually lessons to be learned on both sides of the aisle, here.
1) Riding a bike at night can be extremely dangerous. I actually made a left one time and a kid who was flying down the shoulder of the road on a bike in the dark slammed into my car door. My eyes were concentrated on the road. Not in a thousand years would I have thought to check the shoulder for a kid on a bike in the dark going 40+ mph down the hill.
2) Even if you're fairly okay to drive, it's not a good idea to chance it if you're over the legal limit. You could have some freak thing happen, such as the aforementioned dude on a bike, that might have even been unavoidable if you were sober... but if you're drunk, you are likely going to get "screwed" (I'm using that as a technicality in this case, because obviously you shouldn't be driving drunk to begin with).