Jazz Chisholm Jr. had a rest on his music sheet at an inopportune time for the Yankees.

Join Post Sports+ for exciting subscriber-only features, including real-time texting with Greg Joyce about the inside buzz on the Yankees.

The Bombers second baseman fell asleep at a critical spot in the top of the third inning during Tuesday’s ALDS Game against the Blue Jays in what turned into a disastrous frame.

With runners on first and second with one out, Blue Jays outfielder Daulton Varsho flicked a short fly ball to left-center field.

Left fielder Cody Bellinger came flying in, but his sliding attempt saw the ball bounce off his glove and deflect to Trent Grisham, who flipped the ball in to Chisholm at second base.

As the ball went to second, Davis Schneider — standing at third — dashed home, but Chisholm didn’t immediately turn around, and by the time he did and threw home, it was too late.

Toronto then tacked on three more runs to take a 6-1 lead and chase starter Carlos Rodon from the game after just 2 1/3 innings.

Chisholm, after a flyout in the first inning, dropped his postseason batting average to .176.