Brentford boss Uwe Rosler admitted his side became complacent before eventually wrapping up a 3-1 win over struggling Colchester.
The in-form Bees were in cruise control early on after goals from Marcello Trotta and Adam Forshaw had given them a two-goal lead and U's defender Josh Thompson was sent off. But teenager Drey Wright gave Colchester hope and Brentford had to rely on Harlee Dean's late goal to extend their unbeaten league run to 10 matches.
"I think we almost made too good a start to the game, in a way. The first two goals that we scored almost came too early on in the game and we thought that the game was won," Rosler said.
"We got a bit careless and a bit sloppy with the way that we were playing and that cost us a bit. But we're in an absolutely brilliant position at the moment and we have to keep believing in ourselves.
"It's entirely up to us now, but we did a very good, professional job. The referee put himself in a very difficult position, because he started to throw yellow cards around.
"In these conditions, if you do that you leave yourself open and it was inevitable that there would be another red card at some stage in the game. I think the conditions meant that the challenges looked worse than they actually were."
Colchester manager Joe Dunne said: "There were lots of positives to come out of the game and we were brave, but we didn't get anything out of it and we're judged on results.
"The application after the first 10 minutes was excellent, but basic errors cost us again. When the ball comes into the area, we have to be able to defend it better overall, there were a lot of positives to take.
"Drey Wright was outstanding - he had an exceptional debut and really showed his strength and all of the young players who played for us showed great courage. In our previous two games we'd been a bit tighter and I've taken a bit of stick for it, so we went and attacked them.
"Unfortunately, we were chasing the game again and we don't seem to have the balance between attacking well and defending well. Two of the three goals that we conceded were basic goals."