Symptoms include: 1  excessive fatigue and exhaustion. 2  non-refreshing sleep (you get sufficient hours of sleep, but wake fatigued) 3  overwhelmed by or unable to cope with stressors. 4  feeling rundown or overwhelmed. 5  craving salty and sweet foods. 6  you feel most energetic in the evening.
The blastocyst is the second major stage of development, after the morula, for a newly fertilized individual once cell division has begun. Cells begin to differentiate, or become specialized, and have moved on to an outer/inner arrangement: the outer cells are called the trophoblast which will give rise to the placenta, and the inner are called the embryoblast (or inner cell mass) as they will give rise to the embryo.
Within the blastocyst, there are two types of cells. In the interior is the inner cell mass, a portion of which will begin to divide at a very rapid pace and become the developing fetus. It is surrounded by a fluid-filled cavity called the blastocoele.