Opportunity Costs

Well,I think what economists mean when they talk about opportunity costs is that they or anyone will have to make a decision and will have an effect from that decision either a good one or a bad one. For example,earlier this week I had went to sleep at about one o'clock doing probably nothing because I couldn't go to sleep. Instead of me going to sleep at my regular time,I had an opportunity cost which was being very tired the next day in school. So believe me,I will never do that again for no reason,unless I have homework of course.