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Moreover, in Japanese culture (and many others), relatives feel a strong obligation ( giri ) to care for each other’s children properly. That moral pressure doesn’t exist with non-related parents.
Studies show children exhibit lower cortisol (stress hormone) levels overnight with known relatives versus non-related peers. shinseki no ko to otomari dakara 1 better
That hesitation disappears with shinseki — hence, 1 better . Sleepovers can be emotionally intense for young children. Being away from parents triggers separation anxiety. But being with a cousin they’ve known since birth — even if not best friends — provides a subconscious sense of belonging.
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That’s 1 better in convenience. In Japan, extended family plays a larger role in childrearing than in many Western countries. Otomari (お泊まり会) is common among cousins during obon (summer festival) or New Year’s holidays. Children sleep in futons side-by-side in the grandparents’ home.
If your child gets a fever at 2 AM, a relative will call you without hesitation. An acquaintance might hesitate, fearing overreaction. That hesitation disappears with shinseki — hence, 1 better
When your child sleeps over at a friend’s house, you rely on the friend’s parents — people you may know superficially. With relatives, biological or in-law, trust is deeper. You know their habits, bedtime routines, discipline style, and tolerance for noise or allergies.