I’ve tried. With limited success.
When you are young you attempt this for a variety of reasons – the chief one being the period of time before you actually go to sleep. You hope to be busy. If you are lucky, both of you can occupy yourselves profitably in this period, and the less said about that the better. Mind you, if there is money involved in that profit, one of you is doing it wrong…
But after that period in your life, the time spent in bed – the bit where you actually go to sleep – can be increasingly difficult. If sleep is wanted, and needed, you require a few simple things; warmth in winter, coolness in summer, a reasonable silence, and lack of movement. As you get older, these become less likely.
Oh, you may be as much a problem as her, and the equation equal on both sides. I’ll leave you to decide who is the culprit. You may wish to set a night-vision camera in motion at dusk to record who steals the covers, thrashes around like a squid, or snorts like a Union Pacific Mallet locomotive going through Ogden. Then replay it to accuse each other. It will be concrete evidence but you’ll never convince the other party that they are guilty.
The chiefest conclusion that you can come to about adults sleeping together is that the old American sit-com TV shows with the parents sleeping in twin beds instead of a double were not as ludicrous as they seemed. They eliminated at least two factors in the blood-shot-eye battles – movement and covers. The noise of snoring, snorting, gurgling or moaning was still there. Fortunately our hearing declines after 60 and this became less of a problem.
The wild card is provided by children or pets who insist on entering the marital bedroom and hogging the marital bed. Neither class of creature respects privacy, personal space, or the need to avoid flatulence. And they have the infuriating habit of sleeping while they prevent others from doing so. It is the reason dog-whips were invented, and recently I found out that you could use these on dogs as well.