One productivity killer for me is when I get distracted by things going on around me. For example, if someone is talking to me and I'm not really paying attention, that can kill my productivity.
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For me it's work. I can't help working when it's already enough. This leads to productivity decreases and depressions. Yes, I use Pomodoro timer to prevent me of overworking. And Buddha and practice helps a lot, too.
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