Dew, From the DARPA website - >>> Among the approaches currently under investigation include novel pharmaceuticals that enhance neural transmission, nutraceuticals that promote neurogenesis, cognitive training, and devices such as transcranial magnetic stimulation. <<<
So it looks like DARPA is trying a shotgun approach. Their stated goal is to produce soldiers who can stay awake for 10 straight days with no sleep - a ridiculous goal, but that's the direction. If Cortex or a BP partner runs a wildly successful Sleep Related trial some day, DARPA will likely become very interested again.
The good thing about DARPA's poor Shift Work results is that it's made it a lot easier for Cortex to carve out the Sleep Related indications from the upcoming BP deal.