Learning to live together is a milestone all couples come to before they walk down the aisle. And no small part of living together is sleeping together -- I mean actual shut-eye, people.
Sleep is one of the most important things in life; and when you're in a relationship, this means sharing a bed and your sleeping habits. When you love someone, you should be able to figure out how to sleep together so the two of you can both get some zzz's.
If you're an independent sleeper who needs to roll away after cuddle time, clueing your partner in on this shouldn't be the end of the world. Spending the next 50 years freezing all night long because your S.O. is an infamous blanket-stealer will not a happy marriage make.
If you can sleep together in peace, you can live life together the same way.
A major loss
Many of us will experience some kind of profound loss while in a serious relationship. This could be the death of a loved one, a crushing layoff from your dream job, or a big missed opportunity of some kind. Loss is just a sucky inevitability in life. But it's also a great indicator of the kind of partner you've got.