Overnight Protein - 1kg

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Product Overview

Overnight Protein is made from high quality milk protein in a 50:50 blend with whey protein isolate for a great taste, providing a source of slowly digesting protein with a high amino acid profile to support lean muscle growth and maintenance as you sleep.

Milk protein is over 80% casein, which is a slowly absorbed protein and around 20% whey, which is rapidly absorbed. Whey protein stimulates the rate of muscle protein synthesis with its high leucine content. Each serving contains 26-27g of protein per serving and low levels of carbohydrate and fat.

Key Features

  • • Slowly digested milk protein
  • • Fuelling gold medal winners since 1992
  • • Contents: 1kg Tub (28 Servings)
Suggested Use

Sleep is one of the most important aspects of recovery and is often unappreciated by many athletes. Regularly feeding 20-25g of protein every 3-4 hours is the best way to support the growth and maintenance of lean muscle mass. Feeding during the night is impractical, so taking SiS Overnight Protein before bed allows quality sleep and quality protein delivery to maximise your training adaptations.

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Suitable For: Vegetarians, Gluten Free, Wheat Free, Nut Free

Directions For Use
  • SiS Overnight Protein should be taken 45-60 minutes before bed.
  • Consume cold or transfer into a cup and then heat in a microwave.

  • Add 35g of SiS Overnight Protein to 250ml of water in a protein shaker bottle using the scoop provided.
  • Shake well ensuring the lid is firmly closed.
Nutritional Information
Suitable For
Nutrition Stats


Typical Values Per 100g Per Serving 35g
Energy 1571kj/371kcal 550kj/130kcal
Protein 73g 26g
Carbohydrates (of which sugars) 5.3g (1.9g) 1.9g (0.7g)
Fat (of which saturates) 5.7g (3.5g) 2.0g (1.2g)
Fibre 3.2g 1.1g
Sodium 0.7g 0.3g


Protein Blend (89%), (Milk Protein Isolate, Whey Protein Concentrate (Milk)), Fat Reduced Cocoa Powder, Natural Flavourings, Thickener (Xanthan Gum), Emulsifier (Soy Lecithin), Sweetener (Sucralose)


Typical ValuesPer 100gPer Serving 35g
Energy 1589kj/374kcal 556kj/131kcal
Protein 76g 27g
Carbohydrates (of which sugars)  5.2g (2.3g) 1.8g (0.8g)
Fat (of which saturates) 5.3g (3.2g) 1.9g (1.1g)
Fibre 1.8g 0.6g
Salt 0.8g 0.3g


Protein Blend (94%) (Milk Protein Isolate, Whey Protein Concentrate (Milk)), Natural Flavourings, Emulsifier (Soy Lecithin), Thickener (Xanthan Gum), Sweetener (Sucralose)

Cookies & Cream:

Typical ValuesPer 100gPer Serving 35g
Energy 1571kj/371kcal 550kj/130kcal
Protein 73g 25g
Carbohydrates (of which sugars)  5.3g (1.9g) 1.9g (0.7g)
Fat (of which saturates) 5.7g (3.5g) 2.0g (1.2g)
Fibre 3.2g 1.1g
Sodium 0.7g 0.3g


Protein Blend (89%), (Milk Protein Isolate, Whey Protein Concentrate (Milk)), Fat Reduced Cocoa Powder, Natural Flavourings, Thickener (Xanthan Gum), Emulsifier (Soy Lecithin), Sweetener (Sucralose)


Overnight Protein - Cookies and Cream

Overnight Protein - Chocolate

Overnight Protein -Vanilla


Why should I use this instead of SiS Whey Protein and REGO Rapid Recovery? What difference would it make?

As we aim for 20-25g of protein every 4 hours, this is difficult to do when we're asleep. SiS Overnight protein contains milk protein, which is made from 80% casein and 20% whey. This is slowly released helping to maximise training adaptations and reduce muscle breakdown over night, without unwanted calories from carbohydrate and fat.


Can I take this before/during/after exercising?

Due to the slow absorption of SiS Overnight protein, we do not recommend that this is taken pre and/or during exercise. After exercise, SiS Whey Protein or SiS Advanced Isolate+ is ideal due to the rapid absorption rates. For maximum benefit, consume SiS Overnight protein an hour before bed.


How much protein is there per serving?

SiS Overnight Protein contains 26-27g of milk protein (depending on flavour).


How many scoops per serving:

Add approximately 3.5 scoops to 250ml of water and mix well.


Reviews (25 Reviews)
Showing 25 of 25 reviews

Just what I wanted and a good deal in the website

Jonathan Black


Great for last meal snack if hungry before bed. Helps digestion at night, making you feel even better in the morning. Great product.



Great way to recover, beats a normal night time drink or alcohol. Great when training hard.

Mr. Joe Beer


Flavour is a little sweet for me, would prefer some options. However, I can’t fault function and that it does what it says on the tin



Run of the mill

Mr Irwin


mixes very well and great warm before bed

Chris Dunne


Super tasty and effective way to boost sleep recovery



Paid full price as wanted to experiment to help sleep & repair muscles overnight According to my Garmin no significant change in deep sleep and initially got measures wrong as scoop inside container very hard to read and was not the right one for directions on outside - so my first attempt was more like a McDonalds shake , which last thing at night didn’t help. Will continue to use as a hot night drink until it finished, but wouldn’t buy again as no way of telling if it repaired/replenished muscles and sleep didn’t change

Dave Thorpe


Great taste, convenient.

Michael Cassidy


Nice tasting and trusted

Bashir Humphreys


Sto testando l’utilizzo prima di andare a letto! Ottima sensazione al mattino



Very nice and good snack

Patrick Jones


Nice texture and taste

Michael Draper


I enjoy a warm mug of this every evening approx. 1 hour before sleep. No unwanted stomach reactions and I don't wake up in the night feeling hungry.



Quite a fine powder but a good slow release protein.



It is a very light protein, and fills you up , perfect for alternative dinner



Have used this for almost a year now at the end of days when I've done a fair bit of activity. I wake up feeling ready to go again.

Paul Corney


Very good product and happy with it Taste is good and like the fact the products are safe to use when competing as they have been wada approved

gavin arber


Only used a couple of times but happy so far.

Adam Nightingale


Mugged by SIS website - pricing a debacle - I’ve found quickly most SIS products available 40% cheaper on Amazon. So why are SIS taking the mickey on their direct website. Ripping customers faces off with huge gouge on their pricing on web page is not a trustworthy thing. If I could give negative stars I would.



Very good for overnight recovery

Andrew Rigby


Enjoying the taste, and is easy to mix. Not sure if it's doing any good yet? don't feel much different before or after the drink.