If the sleep is used to retrain your neural network with data accumulated during the day and clear this short term memory then you're clearly a new person every

If the sleep is used to retrain your neural network with data accumulated during the day and clear this short term memory then you're clearly a new person every day. But assuming the new data set is consistent with previous experiences then you are probably converging to some local maxima or oscilating around some point and you change less and less every night as you get older. In that sense decompensation or PTSD would be symptoms of some retraining with some inconsistent data and having the network diverging.