Speaking to the Radio Times, the actress confirmed rumours that she and Burton sleep in separate beds, but insisted that the decision was made for practical reasons.
"Tim does snore, and that's an element," she explained.
"We've tried lots of remedies that don't work. He has a deviated septum and doesn't want an operation."
Bonham Carter also discussed reports about the couple's living arrangements with The Daily Telegraph, saying: "They say Tim and I are a mad couple with subterranean tunnels between our adjoining houses, and that our children live down the road with another couple.
"We just have two houses knocked together because mine was too small. We see as much of each other as any couple, but our relationship is enhanced by knowing we have our personal space to retreat to. It's not enforced intimacy. It's chosen, which is quite flattering, if you can afford it."
Bonham Carter has previously admitted that she enjoys reading rumours about her and Burton's family life.