Normally, thieves will determine if someone is at home through the curtain whether closed or not. All curtains are closed dose not means safe, you can choose an invisible parts of the living room or bedroom open a slit on curtains, and use a lamp and other things to block the view, so that the thieves will think there is someone in the house. When you decided to going out briefly, leave a light in the room to allude thieves that someone in the home, and prevent the criminal of burglary.