Vandals left a woman extremely shocked after smashing windows in the caravan she was sleeping in near Lytchett Matravers.
Glass shattered all over the victim in the early hours of Monday February 11 - when two windows of a static caravan in Crumpets Farm Drive were smashed with a brick.
Police Constable Mari Montgomery of Purbeck Police said: "The victim, a 53-year-old woman, was asleep in bed at the time of the incident and the glass from the broken window shattered all over her.
"This callous act has left the victim extremely shocked. It is the third incident of criminal damage in three months she has been subjected to and enquiries are ongoing to find those responsible.
"I am asking anyone who witnessed the incident, or may have information about those responsible, to contact police in confidence."
Witnesses or anyone with information should contact Dorset Police on 101, quoting incident number 11:008.