Why does separation anxiety happen at nights?
Separation anxiety is a normal part of your baby's emotional development. Separation anxiety usually occurs when your baby understands that you exist even when you aren't around. Because their sense of time is still maturing, they can't calmly wait for you to return. Separation anxiety at night is no different. It can also occur because of strange noises at night or over-attachment to parents.
From an evolutionary standpoint, separation anxiety makes a lot of sense. A defenseless child will naturally feel anxious and get upset when left alone or taken away from their guardian.
Separation anxiety at night usually starts when your baby is around 6 months old and peaks between 10 and 18 months. It usually gets better by the time your baby turns two. Separation anxiety can lead to disrupted sleep. During this phase of emotional development, your baby may get up several times during the night and cry for you or your partner. It's common during these times of distress for your baby to express a preference for one parent over the other.