Liam Neeson: My tears in the night for Natasha
The actress, the mother of Neeson's two teenage sons, died two years ago, aged 45, from head injuries following a skiing accident in Canada.
The 58-year-old Irish star told the US edition of Esquire magazine: "That's the weird thing about grief. You can't prepare for it.
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Hide Ad"You think you're gonna cry and get it over with. You make those plans, but they never work."
He said: "It hits me in the middle of the night… I'm out walking. I'm feeling quite content and it's like suddenly, boom.
"It's like you've just done that in your chest."