If you share a bed with a partner or spouse, it's likely you have a set routine for bedtime; perhaps teeth brushing, reading and then dropping off to sleep.
But it turns out people feel passionately about which side of the bed you nod off on.
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A Dublin journalist has sparked an intense debate on Twitter after revealing he and his partner regularly switch which side of the bed they sleep on.
"We were just chatting in work and apparently it's weird that Amy and I don't sleep on the same side of the bed every night," O'Rouke tweeted.
"Some nights I like to sleep by the window, some nights the door. It's not really that unusual, is it?"
It turns out that yes, yes it is.
The tweet has racked up over 2000 replies and 600 retweets, with most expressing their outrage at the very idea.
"I know what all these words mean but cannot make sense of how you have put them together," commented one Twitter user.
"You have a side of the bed, and that's your side of the bed, and they have theirs. And that's that. It's a bit like saying, "I think I'll go sleep in the neighbour's house tonight", expressed another emotional follower.
In a follow up Tweet, O'Rourke added some caveats.
"I feel like I need to point out the following:
- First one in chooses
- We've never disagreed over it
- We move pillows and books as we move
- We don't change every single night
- Neither of us are aliens."
He also pointed out that it's similar to how you don't sit in the same dinner table chair every night; a sentiment which attracted its own share of outrage.
One person went as far as to call O'Rourke "extremely f**king weird, actually."
But others were on his side.
"Hello!! My husband and I do this too!! Don't let the haters bring you down," one supporter wrote.
"After sleeping on one side of the bed for a bunch of nights in a row, the first night on the other side feels so good and you get the best sleep."
The Independent reports that a study of 1000 UK adults in 2015 conducted by bed manufacturer Sealy, revealed that 36 percent of couples prefer to sleep alone, with almost half attempting to escape snoring, and a fifth simply admitting they prefer to have the bed to themselves.