I was treated at Beth Israel in NYC and they insist on overnight also. When I asked why, they said that they will be IV hydrating me throughout, and will be monitoring my kidney function. Cispaltin is rough on your kidneys. Hang in and good luck.
Rob Jaffe

6-05, Left Tonsil-T1N2bM0 stageIVA, chemo(Cisplatin), radiation(6660cGy), neck disection, no PEG. HPV negative. (Doc suspects posit)
3-9-09 last of 30 HBO treatments.