Sleep
The period in which most physiological repair occurs; relevant to hair health.
Soumm
4 September 2026
Definition
Sustained, sufficient sleep supports hormonal regulation and tissue repair, both of which affect the hair growth cycle indirectly.
Chronic under-sleeping is a common and frequently overlooked contributor to hair concerns.
Why Soumm includes it
No topical care compensates for persistent sleep deprivation. Rest is part of care rather than a break from it.
See also: Stress, Cortisol.
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