Have there been any long term studies of the Uberman Sleep Schedule?

Title says it all.

Bump Give this one more try before it fades away.

A Google Scholar search turned up this short paper: The Effects of a Combination of Monophasic and Polyphasic sleep (PDF) by one Yvonne Tran, who experimented upon herself by trying a polyphasic sleep schedule. (The paper mentions Uberman in particular in passing.)

Here is her conclusion: