CNN-IBN: The BSE benchmark index Sensex on Thursday fell by over 41 points in early trade to 18464.26, while National Stock Exchange index Nifty declined by 13 points, or 0.23 per cent, to 5,607.05. On Wednesday, the Sensex gained 74.53 points to close at 18,505.38 and the Nifty rose 21.80 points and ended at 5,619.70.