Sleep with him:

When men spend the night with a bed mate their sleep is disturbed, whether they make love or not, and this impairs their mental ability the next day.

So, is there a strategy to living together before marriage…?
The study also provides pointers on how to better remember dreams:

Bed sharing also affected dream recall. Women remembered more after sleeping alone and men recalled best after sex.

And makes an argument for separate beds:

“Historically, we have never been meant to sleep in the same bed as each other. It is a bizarre thing to do. Sleep is the most selfish thing you can do and it’s vital for good physical and mental health. Sharing the bed space with someone who is making noises and who you have to fight with for the duvet is not sensible. If you are happy sleeping together that’s great, but if not there is no shame in separate beds.”

If noise is a big issue separate beds it doesn’t seem as if separate beds will do the trick unless they are in separate rooms.
This does suggest that there might have been more behind the separate beds in those old TV series than simple modesty. They wanted their men bright eyed and ready to work every morning!
Personally, I’d rather be just a bit impaired every morning.

Via Truthdig.