Sleep and anxiety — a bidirectional relationship

The relationship between sleep and anxiety is bidirectional and powerful: anxiety disrupts sleep, and sleep deprivation increases anxiety. The prefrontal cortex (responsible for emotional regulation and rational thought) is particularly sensitive to sleep deprivation — when deprived of adequate sleep, it regulates the amygdala's stress response less effectively.

Chronic insomnia increases the risk of anxiety disorders and depression, and anxiety and depression are themselves the most common causes of chronic insomnia. Treating only one side of this relationship often produces limited results.

CBT for insomnia (CBT-I) is the first-line treatment for chronic insomnia — more effective than medication in the long run. Its components include: stimulus control (bed used only for sleep), sleep restriction (paradoxically effective), sleep hygiene, and cognitive techniques for anxious thoughts about sleep itself.