The half life of thorazine is 30 hours so there's still 25% (200mg?) of chloropromazine in your system. If you tapered down by half after 24 hours, that's 520mg? So there was much more in your system before you stopped because really you were on 800mg if you were taking it every night.

If I were you, I'd slowly decrease it with the help of a doctor. Apparently there's no tolerance or addiction but you never really know because everyone's different.

It can cause symptoms of psychosis with withdrawal - Lack of sleep can do this even for people that don't have problems with anxiety or psychosis.

Stay safe!