Moreover, not all parents/families are the same. Some are heavy sleepers, some are light sleepers. Some get to sleep easily, some have difficulty getting to sleep. Some families have everyone on the same schedule, other families have everyone on shifted schedules. Some have generous parental leave or a non-working parent and can devote significant direct time/attention to kids, others are working full time with little parental leave and not much support. Some are extremely relaxed and are unfazed by noise or mess, while others are anxious and have trouble controlling physiological responses to stress. And so on.
