Learn English – Word for someone who pays attention to details

Your question already contains the best adjective: nocturnal refers to being active at night and sleeping during the day. I don't know about elegant, but this is certainly the most technically-correct word you're going to find. Unfortunately, it doesn't have a noun form, but that can usually be fixed by rearranging your sentences a bit.

Sally was a night owl who was always late to early-morning meetings.

Sally's nocturnal tendencies made her chronically late to early-morning meetings.

I do want to note that in most contexts, I wouldn't interpret either night owl or nocturnal (when applied to people) as explicitly sleeping during the day and working at night. Both words just imply that, left to her own devices, Sally would prefer to go to bed late and get up late, where "late" could have different definitions for different people. If you need to make it clear that someone sleeps during the day, then either you need to say that ("sleeps during the day") or refer to them working the graveyard shift (which admittedly is not the most elegant of phrases).

While this might not be an exact fit, marketers often follow something known as the Goldilocks Principle:

The Goldilocks principle is derived from a children's story Goldilocks and the Three Bears in which a little girl found a house owned by three bears. Each bear owned a separate copy of many things, such as food, beds, etc. After testing each of the three, Goldilocks determined that one was always too much in one extreme (too hot, too large, etc.), one was too much in the opposite extreme (too cold, too small, etc.), and one was "just right".

Known as Goldilocks pricing in market-speak, this usually involves presenting the customer with three options: budget, standard/regular, and premium/prestige. While the product is seldom identical, it could well be that the three options differ only minimally. The customer is usually drawn to the standard product as it feels "just right". Customers who want to feel like they are being prudent and thrifty will go for the budget option. Premium, status-conscious, or prestige buyers, on the other hand, will opt for the high-end version of the product for any of a number of reasons: belief that it ensures the best quality, status, etc.