The benchmark Sensex today rose by over 145 points and the wider index Nifty regained the crucial 5,000 level after 16 months.The Bombay Stock Exchange benchmark index Sensex settled at 16,886.43 points, higher by 145 from its last close. National Stock Exchange index Nifty shot up by 44.15 points to 5,020.20, retaining over 5,000 level for the first time since May 22, last year.