Elevated levels of homocysteine in the blood appear to increase the risk of heart attack, stroke, peripheral vascular disease, and venous thrombo'embolism (blood clots in the veins). Homocysteine is believed to damage blood vessels in several ways.
I don't know for sure about how long Wrens usually spend on the nest at one sitting.. (Sorry couldn't resist the joke) However, the eggs usually hatch in 13-18 days, so if there were no hatchlings when that time elapsed, then you'd know for sure that she hadn't been behaving normally.
It can take anywhere from an hour up to a day for a pipped egg to hatch. Some will pip a bit and then stop for a long time, then finish up all at once in the space of a few minutes. Some will consistently pip until they pop out, within an hour.And anywhere in between.ry to keep the humidity high when hatching. The last 3 days the temp can go down a very small amount and the humidity should go up some. The chick that is in the process of hatching is absorbing the egg yoke and has plenty of energy from that. It should last 3 days.