A quick question for all polyamorous people

My question is about overnight dates.

I’m curious what type of relationship you need to be in to feel comfortable enough to have an overnight date. New? Long term and committed? Is a FWB okay?

How invested do you need to be? Do you need to be in love with the person, or perhaps sleeping over with someone isn’t something you want to do at all.

I know everyone is different…maybe it’s the former psych major in me that wonders and asks. 

Thoughts?

*update* This question is coming from a place of wanting to understand other points of view. It goes along with some processing I’m doing, but it’s from a positive aspect. Personally, I need to be in love with or deeply connected to the person I spend the night with. Sex is one thing, being vulnerably asleep in one’s arms is another. I find it fascinating to see how others think.