Thank you for your query on Healthcare Magic.
Waking up from sleep around this age group is common. This is due to separation anxiety
This is due to increased clinginess around this age group.
The stage is called rapproachement-may be a reaction to growing awareness of the possibility of separation.
Separation anxiety will manifest at bed time.
Introduction of a stuffed toy or a special blanket as a transitional object which works as a symbol of the absent parent and child will develop to sleep in the absence of a parent.
Hope I have answered your query.