Re: Sensei -- drinking??
Well, in Aikido we are learning to deal with conflicts & you are afraid to mention something to your Sensei that his behavior is dangerous. I understand just how difficult this must be. He might actually welcome some feedback since he probably does not realize. Even if you do mention it to him there is no guarantee he will take your advice to take some time off. If you don't want to risk talking to him in person maybe write an anonymous note,but do something soon. Don't wait for others who may not do anything either. You are just as important as everyone else in the dojo. At least you will be able to sleep at night knowing you've done your best.