His unraced dam, Papillon De Bronze, is a daughter of Marju, winner of the Group 1 St James's Palace Stakes.
He returned to Ascot in December for his next race, the Grade 3 Betfair Exchange Trophy Handicap Hurdle, where he started as joint favourite for only the second time in his career.
[3] In December he won the Betfair Exchange Trophy Handicap Hurdle for the second time, on this occasion ridden by Tom O'Brien as his regular jockey, Jonathan Burke, was injured.
His appearance at the 2023 Cheltenham Festival again ended in fifth place in the Champion Hurdle, this time starting at odds of 150/1 and finishing 32 lengths behind the favourite, Constitution Hill.
[1] The eleven-year-old began the 2023/24 season with a return to the winner's enclosure for the first time in two years, winning the Autumn Cup Handicap on the flat at Newbury with jockey Oisin Murphy.
With the withdrawal of fancied runners Constitution Hill and Shishkin due to the heavy ground, Not So Sleepy started the outsider in a field of four at odds of 9/1.
Jockey Sean Bowen kept him tucked in behind the leader, Goshen, until the second last hurdle, when he went clear and kept on to win comfortably by 8 lengths from the mare Love Envoi, becoming the oldest winner of the race in its 54 year history.