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6. The First Time You Actually REM-Sleep Together
Sleeping together is one thing. SLEEPING together is another. Here is your future-every-night. So take careful, scientific note of any notable instances of snoring, sleepwalking, larcenous duvet-hoarding and/or drool puddles of unusual size. And then think carefully before accepting that next sleepover-party invitation, or in 10 years you might find yourself sleeping on the sofa wearing earplugs. (And if you're sure he's worth it, take this moment to invest in a really comfy sofa.)