classes:  lecturer. Her communication was good, but she sounded sleepy at one time, studying four periods continuously, so about two periods later, some of you fell asleep.  curriculum. Her communication was good, but she sounded sleepy at one time, studying four periods continuously, so about two periods later, some of you fell asleep.  facility. Her communication was good, but she sounded sleepy at one time, studying four periods continuously, so about two periods later, some of you fell asleep.  general. Her communication was good, but she sounded sleepy at one time, studying four periods continuously, so about two periods later, some of you fell asleep.