The sweet dreams of summer can shatter all too quickly and turn into an autumn nightmare and yet another winter of discontent.

The Adam Gase Jets are suddenly playing with fire after burning themselves against the Bills. Here comes an angry Browns team that will be visiting for MNF, and six days later Tom Brady and Bill Belichick and … gasp … Antonio Brown … will be waiting in ambush in Foxborough with an extra day of rest after a road homecoming game against the Fish Tank.

And then after the Jets’ bye: Eagles on the road, Cowboys and Patriots at home.

So Monday against the Browns screams MUST WIN.

Beat the Browns.

Yes, it’s only Week 2, but the Jets cannot afford to lose their first two home games with a Murderers’ Row like this on the schedule.

I know, I know, it’s only Week 2, but does anyone really think these Jets could replicate the 0-2 2007 Giants and get off the canvas to win a Super Bowl?

The Jets cannot let Baker Mayfield plant an orange-and-brown flag at midfield and they cannot allow Odell Beckham Jr. to return to the scene of The Catch and remind Giants fans what they’re missing and therefore carry a potential crisis of confidence into Gillette Stadium.

No one can say for certain who or what these Browns are after the Titans unceremoniously knocked the hype out of them, and the time to get them is now before novice head coach Freddie Kitchens can figure it out, if he can.

Mayfield isn’t one to be humbled — it is part of the reason GM John Dorsey made him the first overall pick of the 2018 NFL Draft over Sam Darnold — and is likely to trumpet a Browns-against-the-world narrative designed to galvanize the locker room.

X-rays on Mayfield’s bruised right hand were negative, and with Beckham, Jarvis Landry and David Njoku, he has weapons who undoubtedly will be licking their chops over the Jets’ lack of an elite pass rusher and cornerbacks who won’t have an island named for them anytime soon.

How many of Mayfield’s tendencies Jets defensive coordinator Gregg Williams carries into the Jets Atlantic Health Training Center from coaching in Cleveland last season is an unknown.

This much is known: Since 2017, only 12 of the 97 teams that started the season 0-2 recovered to make the playoffs.

Now let’s see Gase get off the canvas and be that play-caller/quarterback whisperer who can help Darnold make that much-ballyhooed second-year leap.

It is why he was hired for this quarterback-driven league after the succession of Jets defensive head coaches who preceded him.

Gase and Darnold was trumpeted as a marriage made in heaven.

No one around the Jets wants the honeymoon to be over so soon.

The offense that Darnold expected to be electric was electrocuted by the Bills.

The attack offense that Darnold advertised was under attack all day by the Bills. The Bills, often having their way with the Jets offensive line, dictated the terms of engagement. They deflected five of Darnold’s passes at the line of scrimmage and dared him to throw to anyone other than Jamison Crowder underneath.

“It’s about hitting the big plays when they’re there,” Darnold said. “We were dinking and dunking it a lot, which is fine — we just gotta hit the big plays. When those big plays are there to be made, we gotta make those plays and I gotta make the throws.”

Gase and Darnold have to show more nerve. Take what you want instead of what they give you once in a while.

Gase felt better about Darnold’s performance after watching the tape, as did Darnold, but if Robby Anderson gets open deep against the Browns’ Greedy Williams and/or Denzel Ward, Darnold has to hit him next time. He missed him twice with the game on the line.

“There’s no excuse for it, I just gotta be better and more accurate,” Darnold said.

That the Jets are in kicker hell and holding more kicker tryouts on Tuesday only makes it more urgent that Gase and Darnold fix the offense now.

Center Ryan Kalil took blame for communication issues with Darnold, and the receivers occasionally were at fault with their route-running. Ironic how it seemed as if Le’Veon Bell was about the only one who didn’t show up rusty.

The 2018 season ended with an NFL-record 73 games decided by three points or fewer, while 68 percent of all games were within eight points in the fourth quarter.

Gase and Darnold are confident that it’s all fixable.

Fix it.

And fix it now.