Baseball’s 162-game season is so unrelenting, it can slam some big leaguers into a fatigue wall.

I saw it up close as a Padres beat writer. The mental grind can cook some ballplayers. Other players’ bodies break down. It’s very much a Darwinian world.

Habits, too, can make or break players.

Rickey Henderson, during his Padres days, said one lifestyle commitment enabled his baseball longevity.

“Sleep,” said baseball’s best leadoff man, who reported a disciplined commitment to plenty of zzzzs.

Ample sleep isn’t a frequent option, though, within the annual summer attrition-and-aptitude test for the folks in many baseball front offices.

Major League Baseball’s summer trade market requires these team-builders to up their games. The Aug. 1 trade deadline hounds these baseball seamheads to

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