Adults, like babies, can become overtired. Experts explain why it makes sleeping hard and how to break the cycle. Counting sheep won’t work.

Caffeine’s effects on adenosine receptors, a build-up of caffeine tolerance, and changes in blood sugars all contribute to why coffee makes us sleepy. However, perhaps one of the more obvious ...

The hormonal changes of puberty, the menstrual cycle and menopause can all affect our sleep, but there are also subtler ways that hormones and sleep interact ...

This reaction releases a lot of energy, which the organism can then use to build proteins, contact muscles, etc. The reaction product is adenosine diphosphate (ADP), and the phosphate group either ...