Foods stay frozen longer if the freezer remains unopened, is full, is in a cool place and is well insulated. Usually food in a loaded freezer will stay frozen for two to four days, depending on its size. A half-filled freezer will keep food frozen only about 24 hours. Cover the freezer with blankets, keeping them away from the compressor, to help hold the cold.
Anxiety and depression indices also point to the likelihood of an adverse effect on mental health from shift work and long working hours. Nevertheless it must be remembered that, by and large, shift workers are a self selected population.
Not all shift workers suffer from sleep issues. But, approximately 10% of night and rotating shift workers are thought to have a sleep disorder known as shift work disorder. Between roughly 25-30% of shift workers experience symptoms of the disorder such as excessive sleepiness or insomnia.