The head of the drum is traditionally made from goat skin, providing the djembe with piercing high-pitched tone and slap sounds (struck by the hand near the edge of the drum) owing to the thinness of goat skin (compared to antelope or calf-skin).
Why Am I So Tired While I Am Pregnant? No matter how much sleep you get, you will be tired for at least part of your pregnancy. This fatigue springs from the body changes and emotional stress caused by impending motherhood. Your body is working 24 hours a day, seven days a week, creating a new human being. That's enough work to make anyone tired.
Nausea is a very uncomfortable condition that can be caused by many things, and I am sorry that you have had to deal with this for so long. One common cause of nausea for such a long time is pregnancy, and it would be very important to know if you are pregnant currently. It would also be important to know if you have had any weight loss during this long period.