I know that Benzos are off the list of suspects as they are traceable by urine drug panel tests... Also when waking no "hangover" effect is present and I feel wide eyed and very alert but don't remember going to sleep just straight to REM and the dreams seem very detailed. I have had blood taken and been drug tested ALL clean. Apparently this drug/s is not on the radar which makes it very difficult to pinpoint which tests to ask for and that can be expensive.