"It's been really quite overwhelming recently, just with the volume of everything going on," the 33-year-old actress explained to British Vogue's October issue. "Everything is shifting. It's actually been the s***tiest 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."
On top of all that she recently split with partner Tom Sturridge and is raising their 3-year-old daughter Marlowe on her own.
Life as a single mom hasn't been easy, Miller confessed.
"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 revealed.
"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," Miller added. "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."