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Sienna Miller, Instagram

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Sienna Miller loves being a mother, but she's not afraid to admit that it's also been an exhausting and overwhelming process, especially while juggling a career in the spotlight.

The 33-year-old actress covers the October issue of British Vogue and opens up about what she describes as "the curse of motherhood" after giving birth to 3-year-old Marlowe in 2012.

"Obviously when you have a baby it's the most incredible experience but your life is also catapulted into this chaos and you are exhausted. I could literally get on this table and fall asleep," she explains.

"I'd like to be better at managing things; I'd like to be more super—although we're never going to feel it, even if we are," she continues. "That's the curse of motherhood—we just run ourselves ragged. I'm just trying to get a sense of what that guilt is. I sometimes feel like it's a totally invented emotion. It's strange to be punishing ourselves this way. It's not healthy."

Of course Miller's recent split from her daughter's father, Tom Sturridge, doesn't exactly help the situation either.

Tom Sturridge, Sienna Miller, Vanity Fair Oscar Party

Pascal Le Segretain/Getty Images

"It's been really quite overwhelming recently, just with the volume of everything going on," she opens up. "Everything is shifting. It's actually been the s--ttiest year, and amazing. It's always yin and yang. I feel like if you're excelling in one area, it's hard to manage both and I do feel like the work is going really well."

The couple decided to end their relationship in July after being engaged for three years.

They originally announced their engagement in 2012 and welcomed their daughter into the world six months later. However, sources say they two had been fighting a lot in recent months and realized they needed to think about Marlowe first.

"It was just a case of them being honest with each other and putting first the fact they are parents," a source told The Sun, which broke the breakup news. "[They] still love and respect each other as friends and parents. It's a very amicable breakup and they intend to remain great friends."