Northampton boss Jim Mallinder says his side cannot afford to drift out of games against top Premiership teams.
Saints were slightly off the pace in the second half of a comfortable 35-10 win over Newcastle on Sunday and they next face in-form Bath.
"Our levels did drop off a little bit. It's something we probably need to improve on," said Mallinder.
"You know when you play against the top-four sides you can't fall asleep for 20 or 30 minutes."
The Premiership champions led 28-3 at half-time against the Falcons, but did not add to their tally - and secure a bonus point - until George North's converted try three minutes from time.
|Saints v Bath|
|Bath have not won a Premiership game against Northampton in their last six attempts, with their last victory coming in February 2011.|
Bath, meanwhile, were ruthless against Leicester Tigers on Saturday, making it three wins from three with a resounding 45-0 victory at The Rec.
Mallinder is hopeful England fly-half Stephen Myler will recover from a calf strain to feature against Mike Ford's men, but was pleased with the performance of understudy Will Hooley, who scored a try on the way to an 18-point haul.
"I'm very pleased with him. He's improving all the time. He's had a good pre-season," said Mallinder told BBC Radio Northampton.
"Stephen Myler not being fit over pre-season (also with a calf injury) has allowed Will to get in there and play and that's how these players get better."
Hooley, 20, added: "Putting the 10 shirt on with the Saints crest on it is all I've wanted to do.
"I know it sounds a bit cheesy, but it really is. I just want to do myself proud and also the team proud."