There are several factors that can interrupt our sleep. Namely, a loud or restless partner can be a recipe for a bad night (or the impetus for sleep divorce, as it was in my case).
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Dear Reddit, Do you sleep better when your partner is spending the night? : r/AskReddit
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Sleeping together can help you sleep better: Hope Mental Health
Why You Probably Sleep Better With Another Person In Bed
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Why You Probably Sleep Better With Another Person In Bed
Why You Probably Sleep Better With Another Person In Bed
Is your partner's disturbed sleep keeping you up at night? Letting
Sleeping with Love: How Sleeping With A Partner Helps
Adults Sleep Better Together Than They Do Alone - Neuroscience News
Get better sleep by cuddling up with your partner