Teachers on #ELTchat discussed causes of and responses to the "sinking feeling" that can occur after a lesson does not go as planned. Common causes included unmet expectations, students seeming disengaged or tired, and lessons failing to achieve their goals. It was noted that the feeling is subjective and complex, with multiple perspectives. Reflection was emphasized as important, along with getting feedback from students in a non-threatening way. More experienced teachers said the feeling lessens with experience and confidence, while mentoring can help newer teachers develop perspective. Emotion was acknowledged as natural but should not lead to harsh self-criticism or depression.