Michelle Williams has admitted that she often finds it hard to balance her career and life as a mother.

The actress is a single parent to daughter Matilda following former partner Heath Ledger's death in 2008.

Speaking in the April issue of Elle, Williams confessed that juggling work and being a mother since giving birth in 2005 has left her tired.

She said: "I feel like I'm so good at raising a kid when I'm not working. I don't forget anything. I've got everything covered.

"It's a real luxury to have a moment when I'm not scrambling. I feel like most of my life, I'm trying to do two things at once, both to the best of my abilities. So that leaves me feeling pretty exhausted."

Williams added: "I'm the person who falls asleep all the time.

"You invite me over for dinner or to a party, and there's a whole scrapbook of pictures of me napping. I've even been given a nickname because of my snoring."

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Watch Michelle Williams being interviewed below: