Paisley Park returned to winning ways with a power-packed finish to catch Thyme Hill in the dying strides of the Porsche Long Walk Hurdle at Ascot.
Emma Lavelle's 2019 Stayers' Hurdle winner looked beaten turning for home as he got caught out of his ground leaving the back straight.
At the head of affairs, Thyme Hill and Roksana were still apparently going powerfully, and Paisley Park looked to need a minor miracle.
On jumping the last Aidan Coleman went into overdrive, but still seemed to have a mountain to climb - with Thyme Hill, who had seen off Roksana, looking sure to collect.
But Paisley Park (9-4), who is well known for his strong finishes, picked up impressively in the testing conditions to win by a neck.
The result is even more meritorious, considering Paisley Park was found to be suffering from a fibrillating heart when he was beaten at Cheltenham in March.
The eight-year-old is now 7-2 favourite to regain his Cheltenham crown too at the Festival with Betfair.
Not So Sleepy repeated his front-running tactics to win the Betfair Exchange Trophy for the second year running.
Hughie Morrison's talented dual-purpose performer has been called a few names in recent months because of his antics on more than one occasion.
He has been reluctant to race in the past and only recently decided to unseat his jockey at the first flight in the Fighting Fifth Hurdle, before running loose and carrying out Silver Streak at the next.
Ironically Silver Streak’s jockey at Newcastle was Tom O’Brien, yet this time he got the leg-up off Morrison in the Ascot paddock – hoping the 20-1 chance would behave himself.
To his credit Not So Sleepy then never put a foot wrong, and nobody has ever denied his talent – he even ran in last year’s Champion Hurdle.
Having strung the field out, he began to tire having jumped the last – but O’Brien had saved just enough and held off top weight Buzz by a length and three-quarters.
Lightly Squeeze was third, with the well-backed Benson flying home for fourth to pip Belfast Banter.
O’Brien told ITV Racing: "He cost me a few quid at Newcastle – but he’s paid me back now!
"He has his quirks but he seems to love it here. I thought I was pressing on soon enough, but I didn’t want to disappoint him turning for home. He tried so hard."
The competitive 17-strong race clearly suited Not So Sleepy, and O’Brien added: "It’s different at the start of a big-field handicap.