@plumebaby
As a number of posters have said, there is no right or wrong here, but it's not unusual for a couple to sleep apart. Indeed many people do. There are all sorts of reasons for not sleeping together. People get better sleep, they work different hours, they have different ways of sleeping (one will be a heavy sleeper, one will be light,) and one will be cold whilst the other is hot. Also one (or both) will snore/fidget/fart/hog the duvet etc.
Sleep deprivation is used as a form of torture for a reason, because it's severe. It's detrimental to your health (mental AND physical health,) and it can make you ill. And getting a superking bed doesn't always help, because it doesn't stop you hearing your partner/spouse snoring like a buffalo.
As has been said, many people have separate bedrooms/bed, and sharing has historically been something that only poorer people do because of lack of room/lack of funds/to keep warm. If you have spare bedrooms, it's ridiculous to share if one of you cannot sleep properly because of the other.
It's all very well saying 'it's no good if one of the couple is not happy to have separate rooms.' But it's also no good if one of the couple is not happy with sharing a room and getting naff-all sleep. Getting proper sleep is far more important than someone's bruised feelings. And them getting sniffy and arsey because they are 'lonely' in bed at night, (or feel it's a slight on them, and a bad way for their wife/husband to treat them,) is just really petty, and unfair on your partner.
I know a woman who couldn't sleep because of her husband's snoring, and she wanted to sleep in the spare bedroom they had. He said he would leave her if she moved out of the 'marital bedroom.' Stupidly, she stayed with him, and carried on sharing a bedroom with him. I'd have told him to get tae fuck. Threatening to leave me because I want to be able to bloody sleep! Sod that! Awful, manipulative, controlling behaviour. Not a relationship I would stay in.