What Causes Restlessness In A Child Having Cerebral Palsy?

Sir, My daughter 3yrs ,7month ,CP pataient,still being feed on nasal feeding tube, still has no speech, since birth,on 19/11/07. but she able to sit,stand and walk a bit with assistance, still has no 100%vertebral control, since last five days she being feeling unrest ,not playing, and strats crying from particular hrs of the day i.e 9.00Pmm appox to 11:30PM, throwing & folding her legs very oftenly, after this period she is quite and stable , and goes to sleep, but she is unable to enjoy sound sleep, she often wake-up after one hrs or so , then again after some time she again tries to sleep. She is reluctant to take food all the day, stool & urine is ok , for last three day we have consulated doc. he has prescribe for , mild sedative syrup called phyenargan & Rantec tablets for gastric pain if any, other than phenobarbitone /gardinal-30mg tablets. please suggest what can be the cause of such unrest at a particualr time.