Why is morning sickness called as such?

Indeed, this question has been asked by many a pregnant woman who experiences the symptoms all throughout the day. Morning sickness is the condition wherein a pregnant woman experiences nausea and vomiting on a regular basis. It is usually experienced by women in the first trimester of the pregnancy. The reason for the name of the condition is that it is usually experienced during that time of the day. However, it is not always the case. As many pregnant women will attest to, the symptoms can occur at anytime and may even go on after the first trimester.