A lack of sleep could have an impact on more than just your mood, according to a new study led by the Surrey Sleep Research Centre.

Researchers found that just one week of poor sleep could affect up to 700 different genes associated with the immune system, metabolism, and stress responses.

Researchers say disrupting the genes increases the risk of heart disease, diabetes, obesity, and stress.

Prof. Derk-Jan Dijk, director of the Surrey Sleep Research Centre at Surrey University, said that not getting enough sleep does more than "just make you tired," The Guardian reported.

"The surprise for us was that a relatively modest difference in sleep duration leads to these kinds of changes," Dijk said.

Previous studies have shown that people who get less than five hours sleep a night are at a 15 percent higher risk of death from a variety of causes than their counterparts who get a full night's sleep.