I. The Human Soul's Activities in the Course of Time

If you pay attention to such things, you will soon notice that emotions are a greater hindrance than perceptions when going to sleep, and especially emotions that are related to the most intense interests of the ego. If a person is anticipating a particular event, they often won't sleep for weeks. Just try it: an event that is bound to occur with a certain degree of certainty, for example the appearance of a comet – if you are not an astronomer who has an ego interest in it – will keep you awake quite well. Not the astronomer, because he has calculated and is waiting anxiously to see if his calculation is correct.