People with separation anxiety have excessive fear about leaving home or being away from those to whom they feel attached and secure.
Separation anxiety is thought to be the number one anxiety problem in childhood.
It is also prevalent amongst adults, especially young adults who are going through transitions. If I moved away to go to university, I may wish to go home a lot or to frequently call home. I do not like to be in new situations unless someone whom I feel close to is with me. I have in the past refused to sleep away from home. I often have nightmares that involve the theme of separation.