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only sleep with him if you are OK with the fact that it probably won't develope into a relationship.
Late night calls out of the blue mean only one thing: sex
You are a grown woman who can have casual sex if she wants to.
So, long story short: If you want to sleep with him because it might be good and fun, go ahead. Do NOT if you think you'll fall for him. Safe yourself the heartbreak, have a short talk about what each of you expect out of this, so both are on the sane page.