More couples are sleeping in separate beds now than ever before, and it's supposedly saving relationships.

A study from the National Sleep Foundation found that 25 percent of couples in the US sleep separately, and that number is only increasing.

Sleeping separately is becoming so common that the National Association of Home Builders expects that 60 percent of custom-built homes will include dual master bedrooms by 2015.

So why are people moving to separate beds?  Most fights start in the bedroom over sleeping habits, so separate beds offers an immediate cure for quite a few issues.