Sleep plays a key role in maintaining the beauty and health of hair. Insufficient rest negatively impacts the body as a whole, especially the condition of the hair, as it is during sleep that restoration processes are initiated.
This is reported by Finway
The Impact of Sleep on Hair Growth and Life Cycle
Hair goes through several phases of development, including the active growth phase (anagen) and the resting phase. If the sleep schedule is disrupted, the duration of anagen is shortened, leading to a decrease in hair density and growth intensity. For hair follicles to function properly, the body requires a sufficient amount of quality sleep.
Hormonal Balance and Immunity: Why Sleep is So Important
Lack of sleep causes an increase in cortisol levels—the main stress hormone—which harms hair follicles, weakens them, and can lead to hair loss. Without adequate rest, the body cannot fully recover, resulting in stress at the cellular level and disruption of follicle function.
“Lack of sleep contributes to increased cortisol levels—the stress hormone. High cortisol levels negatively affect hair follicles, leading to weakening and even loss. When we do not get enough sleep, the body cannot fully recover, causing stress at the cellular level. As a result, elevated cortisol hinders the normal functioning of follicles, which can lead to hair loss and brittleness.”
In addition to cortisol, the hormones melatonin and dihydrotestosterone (DHT) also play an important role. Melatonin, responsible for circadian rhythms and sleep quality, helps maintain hair strength and density. An imbalance of these hormones due to poor sleep contributes to hair thinning, especially in women. DHT, a form of testosterone, also affects hair structure, and its excess can lead to hair loss.
Sleep is essential for supporting the immune system, which protects the body and hair from harmful factors, including pollutants, ultraviolet rays, and thermal damage. A weakened immune system due to lack of sleep makes hair more vulnerable to external stressors, resulting in brittleness and dullness.
Full rest also aids the body in absorbing important trace elements such as zinc and biotin. Zinc is necessary for cell growth and immune strengthening, while biotin is responsible for healthy hair structure. With insufficient sleep, the body fails to absorb these substances, causing hair to become brittle and prone to damage.