When we’re asleep, our conscious mind is closed to the outside world. Sounds, smells, and physical sensations have limited access to our central nervous system. In the lightest stages of sleep, those aspects of the real world can intrude and awaken us briefly, but in deep sleep we’re not easily
Tag: serotonin synthesis
By the late ’80s, the story of depression being caused by a chemical imbalance in the brain brought on by a serotonin deficiency was very popular. But now, scientists agree that the real story is much more complicated than that.