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After their newborn twin son Max remained under medical care due to birth-weight-related issues, Charlie Sheen tells Us the boy is now fine. (He denied reports that his son had heart-related issues.)

"He's great. Everybody's great. Everybody's home," Sheen, 43, told Saturday at the opening of "Peepshow" at Planet Hollywood Resort & Casino in Las Vegas.

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Leaving them at home wasn't easy, wife Brooke Mueller, 31, tells Us.

"It's the first time weve been away from them for an hour, let alone a night!" she said. "Im struggling more than [Sheen] is."

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Their sleep is "challenged at times," Sheen said when asked if he's been staying up all night. "But we're not going to get any sympathy from any new parents!"

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Max and Bob -- who were born March 14 -- are the first children together for Sheen and Mueller. He also has daughters, Sam, 4, and Lola, 3, with ex Denise Richards, and a daughter, 24-year-old Cassandra, from a previous marriage.