The second-placed Lilywhites lead MK Dons by a solitary point heading into the final round of fixtures as Simon Grayson bids to achieve his fourth promotion out of League One as a manager.
Gallagher has achieved promotion once before himself, but only as a bit-part player during a shorter loan spell with Stoke.
He has certainly been instrumental in North End’s campaign this year, though, the Leicester loanee having played in every league game and scoring 13 times in all competitions.
But even with the prize of Championship football so tantalisingly close, Gallagher is not the one in his relationship feeling the heat ahead of Sunday’s trip to Colchester.
“When you’ve got three kids it’s a bit easier to sleep at night,” the 30-year-old said.
“But my wife keeps waking up and saying, ‘I can’t sleep thinking what’s going on and what’s going to be’, but I’m sleeping like a baby!
“I’ve been in football a long time now. I’ll probably need a sleeping tablet on Saturday off the doctor to sleep with excitement but it’s one of them where if you prepare right, we’ve got a good team and a good squad.
“There’s a lot of us out of contract. I’ve not really thought about that, you haven’t got time to think about that, you’re playing games Tuesday and Saturday.
“My focus has been what it always has been – to get this club promoted. There are nerves. The wife is probably anxious, she wants me to achieve something and see what happens from there.
“I’m sure if you ask any of the other players and the manager’s wife they will be anxious because they witnessed the heartbreak of last year and the way I was for a few weeks after. She (Gallagher’s wife) probably wants to see the other side. It would be nice.
“I said we’ll know more after Sunday so just get a bit of sleep and relax! I’m a fairly relaxed person and in the changing room we’ve got a lot of level-headed players which keeps the club in good stead.
“We’ve got none that are getting carried away because you know how football can change in an instant.”