The professor holds up a glass of water in class and asks students to guess its weight. When the students provide guesses, the professor notes that he doesn't actually know the weight unless he measures it. He then asks what would happen if he held the glass up for longer periods of time - minutes, hours, days. The students note that his arm would begin to ache and could become numb or require hospitalization. However, the weight of the glass did not change. The professor explains that problems are like the glass - they may seem manageable at first but can paralyze us if dwelled upon. It is important to 'put the glass down' by not stressing about challenges when going to sleep so that we can