Republic of Ireland midfielder Jason Knight was on the scoresheet as Derby recorded their biggest win of the Championship season with a 4-0 triumph at Birmingham which saw them climb out of the bottom three for the first time since the end of October.
Three goals in 10 first-half minutes did the damage for Wayne Rooney's side as they responded strongly to their stoppage-time defeat by Preston on St Stephen's Day, which had ended a previous six-game unbeaten run.
It also did no harm to Rooney's chances of being appointed as the permanent successor to Phillip Cocu, who was sacked as manager in early November, as the club await a potential takeover by a consortium.
However, Birmingham are now looking over their shoulders as Aitor Karanka's men have not won any of their last five and their last home victory was back on 28 October.
Birmingham Neil Etheridge was at fault in the 15th minute as he gifted the visitors the lead as he dropped Graeme Shinnie's corner under no pressure.
Krystian Bielik was the grateful recipient as he hooked the ball into the empty net for his first Derby goal.
And Etheridge was beaten again in the 17th minute. Blues captain Harlee Dean challenged Sibley and referee Tony Harrington pointed to the spot, with Shinnie emphatically converting the penalty.
Derby were rampant and Rooney's side took advantage of some dreadful defending from a corner.
Matthew Clarke flicked it on at the near post and everyone in blue watched as Colin Kazim-Richards slid it in unchallenged at the back post.
And Ireland international Knight, who won three senior caps in 2020 after being promoted from the Irish Under-21s by manager Stephen Kenny, added to their woes in the 77th minute, converting Kamil Jozwiak's cross as Derby scored four away from home for the first time since their famous play-off semi-final win at Marcelo Bielsa's Leeds in May 2019.
Sean Maguire was also on target as Preston recorded a 2-0 over Coventry.
Maguire applied good pressure to set Daniel Johnson up for the opener and then he secured the points when he flicked home after a goalmouth scramble in the 53rd minute.
Championship leaders Norwich dropped points for the second time in four days after being held to a 1-1 draw by struggling QPR at Carrow Road.
After losing 1-0 at Watford on Saturday, the Canaries slipped up again as the visitors recorded a hard-earned point in a game of two penalties.
A dominant Norwich side looked as though they had won it when Teemu Pukki scored his 11th goal of the season from the spot with 15 minutes remaining but were pegged back nine minutes later as Bright Osayi-Samuel followed suit for the visitors.
Sheffield Wednesday responded to the sacking of Tony Pulis by beating play-off chasing Middlesbrough 2-1.
Pulis left the club on Monday night having been in charge for just 45 days and 10 games.
First-half goals from Callum Paterson and Liam Shaw secured victory at Hillsborough, with the hosts holding on after Duncan Watmore pulled one back.
Huddersfield made it five home wins in a row as Naby Sarr inspired a dramatic 2-1 victory over Blackburn.
Rovers thought they had salvaged a point when substitute Sam Gallagher pounced with four minutes left to cancel out Sarr's headed opener.
But the big defender had the final say as the game entered injury time as he ghosted on to Pipa’s floated pass to grab a stunning winner.
On-loan Leicester midfielder Kiernan Dewsbury-Hall scored his first goal for Luton as the Hatters ended a run of three games without a win by defeating Bristol City 2-1 at Kenilworth Road.
Glen Rea fired the hosts in front after 17 minutes, but Sonny Bradley’s own goal just after the hour restored parity.
Luton took only seven minutes after that leveller to find the winning goal, with Dewsbury-Hall netting a fine strike to clinch the three points.
Barnsley condemned Rotherham to their fifth defeat in six matches.
Cauley Woodrow put the visitors up inside eight minutes before Alex Mowatt doubled their advantage. Michael Smith pulled one back but Barnsley held on to win 2-1.
Wycombe picked up a valuable three points in their fight against relegation as headers from Ryan Tafazolli and David Wheeler gave them a 2-1 win over Cardiff despite Junior Hoilett’s late goal.
James Chester scored a second-half own goal for Stoke to cancel out team-mate Jordan Thompson’s strike in a 1-1 draw with Nottingham Forest.