A homeowner in Crowborough was woken by a radio in the lounge of his home in Aldervale Cottages at 3am on Saturday (June 10).
When he went to investigate, he discovered the back door open and indications that the offender had entered through a kitchen window.
It appears that nothing was stolen, but a number of items of food were dropped on the lawn outside.
Officers and a crime scene examiner visited the scene and provided home security advice.
Police would like to hear from anyone with information about this incident or who may have seen anything suspicious in the area at the time or in the day or so leading up to it.
A police spokesperson said:
"We suggest that people in the area check their own properties to make sure that no attempts have been made to gain entry.
"As we enjoy this first real taste of summer, people should ensure that their homes are secure when they are out or off to bed. Find out more about protecting your home from crime.
"Anyone with information can contact Sussex Police online or call 101 quoting serial 22 of 13/06."
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