According to Merriam-Webster:
(of a bird or other animal) Use or build a nest: "the owls often nest in barns"; "do not disturb nesting birds".
Fit (an object or objects) inside a larger one: "the town is nested inside a large crater on the flanks of a volcano".
According to Laura:
The desire and or attempts of an expectant mother to achieve and/or maintain a level of cleanliness that is unattainable, unreasonable, or unhealthy. Also the desire to finish all partially completed projects regardless of feasibility.
Alex is studying furiously for his finals next week. It is rather hard to believe that we're already 1/4th of the way through medical school! It seems to have gone by at hyper speed, but then things tend to to that when you're busy. After that he'll have 10 weeks off for the summer to help me attain and maintain a perfectly spotless home 100% of the time put a crib together, and maybe even go golfing with some friends. He has worked so hard this year, and it will be a much deserved break (though he will be doing research part time with a professor). Not to mention it will be the last summer he has off, um, ever. So we're going to live it up! (Ha)
In the meantime, work has lightened for me quite a bit. Things were busy through March and most of April, but now that the national April ACT test has past, things have gotten quite a bit quieter. Seems like not as many kids are studying for the June test. Go figure. This has left me with quite a bit of time on my hands. Which may not be the best thing for a near term pregnant woman. In fact, I am only blogging now to keep myself from going at the baseboards with gloves and a Mr. Clean Magic Eraser. In fact, this is how I have been feeling lately:

This- feeling- has been exaggerated by the fact that it is spring time, and its natural to want to clean all the things in spring time, also it is shedding season for one black Labrador who shall remain nameless; but she wanders and leaves her black shadow all over my floors, wall, couch, and anything that touches her, or anything that touches something that touched her. Ever. We also just had two successive sets of house guests. (Grant, Trevor, Shelley, if you read this I am so glad that we were able to have you over, and that we were able to share our air-mattress with you.) All of these things are contributing to a building sense of anticipation and mania that will probably only cease when i am too exhausted to continue, or my husband hauls me away in a maternity strait-jacket. Which he may do in the very near future. Like in two weeks when he isn't busy studying. So in the meantime, with my husband distracted by neuroanatomy, I am going to go clean all the things. Probably twice.
Cheers.
I also found this article to be entertaining, and also a little too close for comfort. Let the irrationality begin. Err... continue.