We try to emotionally scaffold DS9's sleep anxieties with various techniques used at various times including co-sleeping, cuddles at bedtime, and moving his mattress to the foot of our bed. Sometimes the techniques are used individually. During growth periods, all 3 are utilized. I really hate to ask this question because I tend to follow DS's lead on how to meet his emotional needs. But at what age are these techniques considered inappropriate? DS is emotionally immature, can one judge based on emotional development versus chronological age?