[3] Sleepytime's dam, Alidiva, who was probably the best horse sired by Chief Singer, won at Listed level and was a half-sister to the Prix d'Ispahan winner Croco Rouge.
In addition to Sleepytime produced the Group One winners Taipan (Preis von Europa, Premio Roma) and Ali-Royal (Sussex Stakes).
[4] Sleepytime was trained by Henry Cecil at his Warren Place stables at Newmarket, Suffolk and was ridden in four of her six races by Kieren Fallon.
Ridden by the veteran Pat Eddery, Sleepytime took the lead two furlongs from the finish and drew away to win by five lengths in what the Racing Post described as a "very impressive" victory.
The race produced an upset, with Sleepytime, ridden for the first time by Kieren Fallon, finishing fourth behind the 16/1 outsider Dance Parade.
She started at odds of 5/1, the third choice in the betting behind Pas de Reponse the European champion two-year-old filly of 1996, and the Godolphin challenger Moonlight Paradise.
[11] In June, Sleepytime started 5/6 favourite for the Group One Coronation Stakes, in which her rivals included the Irish 1,000 Guineas winner Classic Park.
Racing against colts for the first time she was made 5/6 favourite but weakened badly in the closing stages and finished tailed-off last of the seven runners.