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Perfect hair Day (PhD)

night cap overnight perfector

SKU# R1005

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An easy-to-use weightless solution that provides up to one week of more shiny, vibrant, manageable hair overnight. Powered by our patented Healthy Hair Molecule (OFPMA) and time- release conditioners, Night Cap is the ultimate beauty sleep for your hair which delivers:

  • shiny hair for days 
  • leaves colour looking more vibrant
  • more manageable hair
  • overnight results that last (up to 5 shampoos)

Perfect hair Day (PhD) Night Cap is ideal for all hair types. It is pillow-safe and silicone-free. Safe and formulated for colour and chemically treated hair.


Wake up to beautiful, healthy looking hair. This fast-absorbing, pillow-safe formula is so genius, it works while you sleep.

Use before bed. Apply to damp or dry hair. Start with 2-3 pumps. Spread product between hands. Evenly distribute from root to tip, focusing on ends. Use more depending on hair thickness or length. Comb through and leave on overnight. Style or wash out in the morning.

Use as often as needed. Fast absorbing. Pillow safe.


How does Night Cap compliment other Living Proof treatments? How do I know which treatment is right for me?

It’s formulated to treat most hair types. Think of it as beauty sleep for your hair. If you have specific concerns:

  • If damage is your primary concern, use Restore Mask, Instant Protection or Instant Repair to undo the damage. Add Night Cap to help keep your hair looking healthy.
  • If frizz is a major concern, use No Frizz Leave-In Conditioner to help block humidity and fight frizz. Add Night Cap to help keep your hair looking  healthy.

Is Night Cap Keratin/Straightening treatment safe?

Night Cap is keratin and straightening treatment safe.  Keratin and straightening treatments are damaging to hair. Night Cap is a perfect product for anyone seeking to keep hair looking and feeling great, particularly after having a straightening treatment.

Night Cap is also sodium-chloride free so it will not affect the results of your treatment.

Will using a clarifying shampoo defeat the benefits of Night Cap?

Night Cap lasts through multiple shampoos, including when you use a clarifying shampoo. 

In general, we recommend not over-using clarifying cleansers, as they strip hair, adding to the cycle of damage.

When should I use Night Cap if I color my hair?

We recommend using Night Cap the evening after your color service at a salon.

If you color your hair at home, apply the color according the manufacturer’s directions. Then follow with Night Cap. 

If I use Night Cap the night before a color service or coloring my hair at home, will it affect my color?

No, it is formulated to not affect your color.  

Can Night Cap be used over any other serums or anti-breakage creams that are normally applied right after showering?

We recommend not applying Night Cap over a silicone or oil-based serum because they minimize the ability for Night Cap to soak into your hair. We recommend if you have a lot of styling product in your hair, to brush your hair to help remove any residue before applying Night Cap.

If you wash your hair in the evening, we recommend you apply Night Cap prior to any other stylers or leave-ins to ensure the greatest benefits from Night Cap. You may not find the additional stylers or leave-ins necessary on the nights you apply Night Cap.

Are the benefits different if you leave it in vs. rinse/shampoo it out the next morning?

The benefits will be the same regardless if you leave it in or rinse/shampoo it out of your hair the next morning. Night Cap’s benefits build over time so do whatever works best for your routine.

If I use Restore Instant Repair Cream, can I use Night Cap as well?

Yes, Restore Instant Repair Cream and Night Cap work well together to keep you hair its healthiest and split-end free.

When and why is it important for a product to be sulfate-free?

You've probably heard a lot about sulfates and generally think they are bad for hair. 

You should watch out for sulfates in Shampoos as when they are used in lathering, cleansing products they can strip hair of its natural surface oils making it feel rough, dry and brittle. Sulfates can also strip the scalp of its natural oils, leading to dryness and irritation.  Examples of commonly used sulfate ingredients that can be stripping include: Sodium Lauryl Sulfate, Sodium Laureth Sulfate, Ammonium Lauryl Sulfate, Sodium Laureth Sulfate.  You should watch out for these in shampoos.

Sulfates do not inflict damage on hair when used in conditioners or treatments.  When used in these products they actually help make hair smoother, softer and visibly healthier.

Sulfates in conditioners and treatments do not damage chemical treatments or color.  Characterizing them as not good for your hair in these types of products is incorrect. 


  • Independent Cosmetic Manufacturers and Distributors
    2015 Independent Cosmetic Manufacturers and Distributors, Cosmetic Innovatory of the Year (CITY) Award for Product Innovation, Haircare
  • Latina Magazine
    2015 Latina Magazine , Latina Magazine 2015 Beauty Awards, Perfect hair Day (PhD) Night Cap Overnight Perfector

love notes

I hope they never quit making this!
Posted by Shaleen on April 08, 2018

I don't quite use this as recommended (I don't like wearing it overnight). However, I like to apply it liberally prior to showering. I usually do this with the Timeless Pre-Shampoo treatment (which I absolutely love and will purchase for life), but I like to switch it up sometimes and use this as a sort pre-shampoo deep conditioning treatment. It makes my hair the softest it has ever felt and feels like I am doing something wonderful for my hair. I hope they never mess with this formula or quit making it! It actually feels like it is improving the health of my hair.

Posted by Michelle on July 14, 2017

I am not one to write reviews, but I do feel this product deserves one. I have been using living proof products for about a year so far and fell in love. My hairdresser recommended me getting the night cap overnight perfector for the summer since I lightened my hair and the sun dries it out. Let me just say, OBSESSED with this product. Not only do I feel like I just walked out a salon, but the product lasts in my hair after washing it several times. I instantly saw a difference, my hair was super soft and shiny. I was even able to style and blow out my hair right after. So happy I found a product I can continuously buy throughout the year!!

This stuff is great!
Posted by Laura on November 01, 2016

I received a free sample of nightcap when I ordered my PhD shampoo( love this site- free shipping!). I was hesitant to use it since I have fine, almost shoulder length slightly altered hair. I was worried it would weigh it down. So I washed my hair at night, left it wrapped in a towel for 20+ minutes to absorb most of the moisture, then applied before bed. It absolutely melted into my hair. I didn't use any styling products or even comb/ brush my hair bc I fully intended to wash my hair the next am( since I was concerned about it weighing my hair down). Well, I overslept and didn't have time to wash my hair. And my hair looked pretty darn good for going to bed with damp hair- normally I would have woken up toba frizzy, unmanageable mess. I needed a couple minutes w the hair dryer to get my side bangs into place, and I was good to go!! I admit my hair had a little less volume than normal, but it was SO SHINY AND SOFT. I think the lack of volume was not using styling products or blow drying it before bed. But in a true believer now! I will try it again, both using it on clean styled hair to see how my" day two, non shampoo day looks, and also putting it on hair at night and washing in the am to see what results are best for me . But I'm very impressed neither your product, as I am all of the LP products I've tried( especially PhD shampoo and conditioner!!)

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