Ten days after the operation he seems to have little or no residual impairment.'

Triazolam, although a short-acting benzodiazepine, may still cause residual impairment into the next day, especially the next morning.

Brotizolam at dosages below 0.5 mg at night usually produced minimal morning drowsiness; no residual impairment of psychomotor performance occurs following dosages within the recommended range of 0.125 to 0.25 mg.

Contributing factors that increase the risk of PPS include aging with loss of neuron units, the presence of a permanent residual impairment after recovery from the acute illness, and both overuse and disuse of neurons.