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I know it's crazy but I think there are really traders who can perform well while they are drunk. Have you seen the movie drunken master? The main character becomes really good at karate by the time he drank a lot of beer and get drunk. The same thing I was talking about there. I heard there's also writers who becomes very creative when they take drugs.
For some it can be coffee and alcoholic beverages. Sometimes we only need to experiment if what beverages or substance works best for us. There are drunk people who are still very conscious about their surroundings so it may be different from half asleep but I don't think someone can function well if they are half asleep.
I think there are some condition where it's still possible for someone to make a good decision while they are using drugs or drinking alcohol. At this point they are still in the early stages where relaxation or euphoria still allows them to be able to control themselves well. But after they enter stage 3 where the next drunken stage will make them lose concentration and lose body control and lose balance.
In the first and second phase, trading is possible respectively because usually these stages still allow one to make good decisions. But not after they entered the next phase. Relaxing is a good state to make decisions, this is also usually needed by traders when they are too tired.