Sensex declined by over 86 points in early trade today as funds and retail investors preferred to book profits after yesterday's gains.Besides, a subdued trend on Asian bourses and tomorrow's expiry in the derivatives segment also led dampened the trading sentiments here.The 30-share barometer, which had gained 21 points yesterday, fell to 18,608. Stocks of power, capital goods, metal, banking and auto sectors succumbed to profit-booking.Similarly, the wide-based National Stock Exchange index Nifty shed 23 points to 5,651.In Asian region, Hong Kong's Hang Seng index fell 0.80 per cent, while Japan's Nikkei Index shed 1.73 per cent in the morning trade.The US Dow Jones Industrial Average ended 0.75 per cent down in yesterday's trade.