Can eugeroic drugs and benzodiazepines be taken within the same 24-48 hour period safely?

Yes, but. Be careful because the eugeroic (wakefulness promoting drugs) can increase diazepam levels to some degree, so you will have to probably decrease your valium dose under the supervision of your sleep doctor or psychiatrist, until you find the dose that you tolerate without it making you excessively sedated. Be careful driving and operating machinery.