Can Poor Sleep Cause Hair Fall? Causes, Prevention and Hair Care Solutions

Reviewed by Dr. Shailendra Chaubey, MD (Ayurveda) | Updated: June 2025

Whilst most people will cite a particular shampoo, or hard water and genetics, the truth could very well be that your hair is suffering due to lack of good sleep over the last few months.

How Sleep Affects Hair Growth

Hair grows mainly during deep sleep. During your sleep your body is carrying out several processes to help your body repair and regenerate. This includes hair follicles. Growth hormone is released, cortisol is regulated and blood is sent to areas of your body which need repairing.

During the growth stage of your hair (anagen phase) constant hormonal signals and good blood flow to the scalp are needed. If your sleep has been disrupted or shortened, your hair follicles will not receive time to recover. Over weeks and months this can lead to more hair being lost.

The Cortisol Connection

Poor sleep and stress go hand in hand. Both cause increased cortisol in your body. Cortisol is a primary stress hormone and whilst it can be helpful in small amounts for short periods of time, long term high levels will damage your hair.

High levels of cortisol will cause your hair follicles to move out of the growth phase and into the rest phase. When too many hair follicles are in the rest phase (telogen), this can cause Telogen Effluvium. This causes large amounts of hair to be lost. The issue here is that there is a delay in hair being lost. This leads many people to not realise that poor sleep can cause hair loss. You often feel like you have had poor sleep for a while and by the time you start noticing more hair loss it feels like it was a while ago.

Research published in journals studying dermatology and endocrinology consistently shows that disrupted circadian rhythms, the internal clock that regulates your sleep-wake cycle, interfere with the hormonal cycles that keep hair in the growth phase. Many people wondering whether is actually a real concern will find that the science firmly says yes.

What “Poor Sleep” Actually Means for Your Hair

Not all sleep issues carry the same weight. Here’s what tends to cause the most harm:

• Sleeping less than 6 hours consistently over several weeks
• Frequently waking up during the night, even if total hours look adequate
• Delayed sleep cycles, such as sleeping at 3 AM and waking at noon
• Sleep conditions like insomnia or sleep apnea left unaddressed
• Irregular schedules that shift significantly on weekdays versus weekends

The occasional lack of sleep will not cause hair loss. However, if you are experiencing regular issues with sleeping then your hair is likely to suffer. A week or so of poor sleep can be reversed but after 3 months it is unlikely to be reversed without taking action.

Other Physical Signals Worth Noticing

In most cases hair loss won’t be the only symptom you experience if you are struggling with your sleep. Your body will often give signs of stress and tiredness. Those experiencing hair loss due to their sleep will often also experience:

• Dry and brittle hair (without any chemicals)
• Nails growing slower
• Fatigue
• Dry skin or increased breakouts
• Thinning hair around the temples and crown.

If you are experiencing a few of these symptoms then it shows there is an underlying issue as your whole body is under stress.

Practical Steps That Actually Help

To improve hair loss caused by lack of sleep you should try:

• Going to bed and waking up at the same time every day including weekends.
• Reducing screen time for at least 45 minutes before bed.
• Ensuring your room is dark and cool to help melatonin production.
• Avoid eating large meals or drinking any caffeine 3 hours before sleeping.
• To improve your hair:
• Focus on nourishing your scalp.

Some people find it helpful to take action to improve your lifestyle alongside improving your hair. have been designed to help identify the internal causes of hair loss. We look at hormonal and stress factors.

Final Thoughts

Sleeping is an active process and your body undertakes some of the most important processes while you are asleep. Just like any other part of your body your hair relies on this time. If you have been experiencing increased hair shedding and consistently poor sleep then it is very likely that they are linked.

Before rushing into using external products to help, think about what your body may be telling you. Hair loss often comes last and is the slowest to improve so the sooner you can tackle the underlying cause the better.