Here's why:
* Hair growth cycle: Hair grows in cycles. The active growth phase (anagen) is typically several years long, but the exact duration varies by individual and location on the body. During anagen, hair grows consistently at a rate of about 0.35 mm per day.
* Overnight growth: While hair does grow throughout the day and night, the rate is consistent. There's no surge of growth overnight.
* Perception: The reason you might *feel* like your facial hair grows faster overnight is likely due to:
* Sleep: When you wake up, you haven't shaved for hours, so the stubble feels longer.
* Skin: Your skin may be more hydrated in the morning, making the hair appear more prominent.
In summary: Facial hair grows consistently throughout the day and night at a rate of about 0.35 mm per day. The perception of faster growth overnight is likely due to factors like hydration and time since last shaving.