Cortisol is a hormone produced by the adrenal glands that regulates multiple vital functions in the body: from blood pressure to metabolism, including the immune system and sleep. Its most well-known ...

Cortisol is known as the body’s primary stress hormone, but it has many essential functions. It naturally peaks in the morning to help you wake up and feel alert and then gradually decreases ...

People who find themselves waking up often in the middle of the night might not realise that something medical could be preventing them from having unbroken sleep. An ITV doctor has claimed that some ...

Under normal circumstances, cortisol begins to rise between 2 and 3am, climbing steadily until it reaches its peak ...