The BSE Sensex declined by over 90 points in early trade today on sustained selling by funds amid a weakening trend on other Asian bourses. The sensex had lost over 298 points in yesterday's session.Similarly, the wide-based National Stock Exchange indexNifty fell by 13.40 points to 5,775.40.In the Asian region, Japan's Nikkei Index was down 2.04 per cent in early trade today, while Hong Kong's market remained closed for a public holiday.