"These effects were specific to episodic learning, with no between-session change expressed in procedural motor-skill learning, or in measures of alertness or reaction time"
The memory relevant for developers is mostly procedural, i.e conceptual memory, i believe. So napping might not be useful(or further research needed).
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3093247/
"These effects were specific to episodic learning, with no between-session change expressed in procedural motor-skill learning, or in measures of alertness or reaction time"
The memory relevant for developers is mostly procedural, i.e conceptual memory, i believe. So napping might not be useful(or further research needed).