Not getting enough sleep every night could actually cause breast cancer in women.
Melatonin, a hormone which makes us tired and crave sleep, fights tumour growth, according to new research.
Shift workers and people who get very few hours of shut-eye every night are most at risk.
Skipping out on sleep can lead to cancer as production of the important hormone is reduced.
Research at Michigan State University found melatonin dramatically decreased the size of tumours.
The study which was published in Impact Journals: Genes & Cancer suggests maintaining our ciradian rhythm helps to regulate sleep.
The researchers found that exposing lab-grown tumour cells to melatonin reduced the growth, even when exposed to chemicals that are known to speed up tumour growth.
Dr James Trosko said: “This work provides an important new technique to screen chemicals for cancer-promoting effects, as well as identify potential new drugs.’
Better hit the hay in plenty of time tonight!