During the pregnancy with my second child, well before the bipolar dx, I had what is called "nesting" in American literature on pregnancy. In my case, it was not about decorating a nursery room but about cooking. I would get an urge to go grocery shopping AT NIGHT (our grocery store is open 24 hrs, conveniently) to buy ingredients for elaborate meals. Once, I needed Cassis - a french berry-based liqueur, to use in a dessert (now I do not make desserts but back then everything was fair game). It is a form of alcohol but you only need a bit and the final dish is non-alcoholic due to heating. At any rate, they refused to sell alcohol to me at the wee hour in the morning! I was so disappointed.

During the day, I did not get those urges. All the clerks at the grocery store knew me, their customary 2AM visitor, often the only one at the store.

I do not know if that was bipolar or just that normal nesting described in the books.