Night at the museum: UK's National Gallery offering guest sleepover

When the Sainsbury Wing reopens after a two-year refurbishment on May 10, the overnight guest -- to be picked at random from a list of newsletter subscribers -- will wake up to breakfast in bed and the chance to explore the gallery before the crowds arrive. The renovated wing will see some of earliest paintings in the collection rehoused -- a chapel-like room for Piero della Francesca's 15th-century "Baptism of Christ" and a new frame for Jacopo di Cione's 14th-century "San Pier Maggiore Altarpiece"...