In an area of our brains called the hypothalamus, we have a body clock that controls our body's natural rhythms. tells us when it's the right time to eat, sleep, work and play. It plays an important part in our physical and psychological well-being. It is, in fact, what makes us tick and it controls many t things including our hormones, temperature, immune functions and alertnes brings these conductor with an orchestra: it regulates tempo and try to in all the different instruments on time to make music rather than random noise.