Don't even worry about that! Z-drugs have less affinity for the GABA-B and benzodiazepine receptors. Stop CT and you'll experience a few nights of poorer quality sleeps. then you'll be finished/fine. You could add magnesium/taurine to help with sleep or perhaps Glycine. I mean if you have some Valium kicking around, you could do a 10mg, 10, 5, 5, 2, 2 , 1mg taper and THIS should leave you all peachy BUT unless you have a job or exam that hinges on a perfect quality 8 hours of sleep, I seriously wouldn't worry about it.
Can I ask you why you started taking it in the first place? Give me a little History and I'll recommend something else for future Zzzz's if you land in the same jam.
Regards, Sandman