PORT ST. LUCIE — Luis Severino spent the winter focused more on Zzzzzzs than potential Ks.

As last season neared conclusion, the veteran right-hander had a conversation with Eric Cressey, the Yankees’ director of player health and performance.

Severino was finishing his season in The Bronx on the injured list with an oblique strain and Cressey wanted to know, among other things, about the pitcher’s sleep habits.

Severino divulged he had trouble sleeping.

With Severino headed to free agency — he signed a one-year contract worth $13 million with the Mets in November — Cressey recommended the pitcher find a sleep specialist.

Severino followed that advice, and after wearing a sleep monitor for three nights, believes the root of his problem was discovered: television.

“I used to stay up late and watch TV,” Severino said Monday. “My TV was always on, because in order to fall asleep I have to experience something and that’s bad.”

The blue light emitted by the TV was causing disruption in Severino’s sleep.

Severino, 30, said he was getting about five hours of sleep per night, but since implementing changes in his routine he’s in the six-to-seven hours range and he expects further improvement.

Music (in a completely dark bedroom) has replaced TV to fall asleep, and Severino is sure to keep the temperature cool, at 67 or 68 degrees.

Other habits include eating dinner at 7:30 p.m. or earlier to ensure he has properly digested before bed. Severino has also found cherry juice and magnesium to help the cause.

He’s now usually asleep within 10-15 minutes of his head hitting the pillow.

Though Severino says the increased sleep hasn’t changed how fresh he feels in the morning, he’s more interested in reducing the fatigue on his body.

“Last year I was feeling [awake] but my body was not feeling good because I was pitching,” Severino said.

The Mets are counting on a better-rested Severino to help anchor a rotation that had questions as camp began.

And those concerns have only increased following Kodai Senga’s shutdown from throwing until mid-March that ensures the right-hander will begin the season on the injured list.

A best-case scenario would be a late-April return for Senga, who was diagnosed last week with a moderate strain of the posterior capsule in his right shoulder.

“He’s the face of this rotation, so having somebody like that go down, the good thing is it’s nothing major,” Severino said. “He’s going to be out, but it’s not going to be the whole year, so I think we have a great group of starting pitching that can hold up until he is healthy and can come back.”

Last season, Severino pitched to a 6.65 ERA in 19 appearances for the Yankees.

Besides the IL stint to end the season, Severino sustained a lat strain in spring training that kept him from joining the Yankees’ rotation until May 21.

He was an All-Star in 2017 and ’18 before Tommy John surgery and a shoulder strain derailed him.

But Severino showed glimpses of his former self in 2022, when he pitched to a 3.18 ERA in 19 starts for the Yankees.

For Severino it’s almost like old times in a clubhouse at Clover Park that includes former Yankees teammates Harrison Bader, Adam Ottavino, Luke Voit and Ben Gamel in addition to manager Carlos Mendoza, who spent four seasons as bench coach in The Bronx.

Mets bullpen coach Jose Rosado, who watched Severino’s throwing sessions this winter in Tampa, was the first Yankees official to watch the pitcher throw a bullpen session after taking his physical upon signing with the club in 2012.

“[Severino] is a family man and a good dude and he cares about his craft,” Bader said. “He’s got electric stuff. I think he’s very honest with himself. There are times we all struggle in this game and he addressed it accordingly. It’s not about getting bitter, it’s about getting better.”

Severino threw live batting practice Sunday and said he might repeat the exercise later this week before getting into a Grapefruit League game.

Already he is aware of the outside projections that the Mets will struggle to compete in this retooling season of sorts.

“With the Yankees in 2017 it was a rebuild and we came within one game against Houston of going to the World Series, so it doesn’t matter what people think,” Severino said.

That’s to say, he won’t be losing any sleep — literally — over outside perceptions of the Mets.