A new study has found that sleeping in the light contributes to three serious health problems: obesity, diabetes and hypertension.

The results of the study showed that older people who often slept with a night light or TV on were more likely to suffer from obesity, high blood pressure and diabetes, compared to those who were not exposed to light during a night's rest. The fact is that light at night disrupts circadian rhythms, and also suppresses the production of melatonin. Over time, this can cause metabolic and heart disease.