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.
The female typically lays two to four light blue eggs-about the size and weight of a quarter (see photo). The female incubates the eggs over a two-week period and both parents care for the young. The eggs take around two weeks to hatch and the chicks will fledge when they are about 12 to 14 days old.he bowl-shaped nests are built in a bush, tree or under the eaves of buildings - 5 to 25 feet off the ground. The nest is 6 inches across and 4 to 6 inches high.