Any problems that might arise due to sensory overstimulation in autism?

YES. Remember how disturbed dustin hoffman became with any new ''stimulation'' in rainman.
Yes. Autistic children are often highly sensitive to sound, light or even touch. It is due to oxidative stress in brain receptors. It is not psychological! See a physician from the defeat autism now group. The hq is in san diego. The only valid treatment is bionutritional.