Circulating air can stop carbon dioxide buildup

Poor ventilation leads to a build-up of carbon dioxide in the bedroom To test the effect of keeping a window open, researchers tracked the sleep of healthy students. They slept with windows or doors either open or shut, and the room temperature was monitored. There was also a motion sensor in the pillow and one attached to the sleepers’ arm. Levels of CO2 were measured in the bedrooms over five days.

The result shows that lower carbon dioxide CO2 levels implied better sleep depth, sleep efficiency, and lesser number of awakening. With a window or door closed, the average CO2 level was 1150 parts per million, compared with 717 ppm when the window or door was open.

Humidity levels were similar in both conditions as were temperatures. This showed that an open window was better for reducing carbon dioxide CO2. The perceived freshness of bedroom air improved significantly when the CO2 level was lower.
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Causes of IVF failure

The most important variables involved in a successful IVF cycle are a healthy egg, normal, functional sperm, and a uterus that is capable of nurturing the growth of a baby.

The human egg is a very complex structure, it is prone to damage and this can render it nonfunctional which may leads to abnormal distribution of chromosomes and nonviable embryo.

During IVF, cell stage, embryo grade and the rate of cell division will determined embryo selection, embryos that have developed to at least the 6 cell stage have a much better prognosis for success than embryos that have 5 or fewer cells on day three.

The egg retrieval and the embryo transfer to correct location are very important to the success of an IVF cycle. Retrieving fewer eggs than expected, or failure to retrieve any eggs, can affect the success rate.

The IVF laboratory factors can lead to failure of IVF. If the equipment are not functioning properly, poor control of oxygen concentration, carbon dioxide concentration, and other factors such as humidity, PH, temperature and light.
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