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The difference for me is...whether I'm alone in the tub or with someone. I usually only have 2 or 3 drinks if I'm going to be in the tub and if I'm talking with someone else I feel tired/sleepy but it's manageable. The problem for me is that when I mix alcohol with 100 degree temp's... I feel dangerously sleepy when I'm using it alone. So I try not to drink and soak. (O.K. maybe just one drink).