The 'small margins' coaches and players allude to every week can be enough to send an insomniac into a deep sleep.
So often, it is those miniscule margins that make all the difference when the ball is booted to touch after the clock turns red for the second time.
A point in case is the very different dressing-room Leinster returned to at half-time in Celtic Park compared to that in St James Park.
Winding back the clock, Luke McGrath got his hands on the ball in Newcastle as Leinster led 10-3 and opted to keep the ball in play when it could have, heck should have, been posted to the stands.
The recrimination for that one decision was a 10-all state of affairs, Saracens boosted and Leinster deflated.
It was a testimony to McGrath that the diminutive battler should reserve his best game for the last day of the season.
The scrum-half was onto Stuart Hogg's boot in a flash to allow Garry Ringrose to suck all the energy out of Glasgow with a critical try, one minute after the Warriors had jumped seven points clear.
The lofted box kicks were spot on, the sniping instinct intact, the pass held up and the all-round impact was of pound-for-pound value.
As Leinster held a 15-10 lead with time up in the first-half, Glasgow were hot on attack.
Adam Hastings threw a long ball to DTH van der Merwe. He was driven into touch by Larmour and Sexton was first on the premises to celebrate that small margin.
"It was a huge play," said Sexton.
"You know, we conceded on that side of the pitch against Sarries just before half-time, and Jordan will say himself that he could have dealt with that situation better if he had it back again.
"He learnt his lessons and came up with a huge play."