I looked into this at some point, and the reports I found of people who had actually tried this seemed to mostly say that it was horrible if you actually tried to keep up with it. It's probably a bad idea to go mess with the 24-hour cycle unless if it's not broken to begin with.

One possibility I'm thinking of is to have the two core sleeps around the workday, for example 4 to 8:30 sleep, then 9 to 17 work, then 17:30 to 19:30 sleep and a 20 minute nap sometimes around 23.