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Product Code

SiS Overnight Protein Powder - 1kg

gluten free
wheat free
nut free


Product Information

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)

Product Uses
Recommended Usage

SiS Overnight Protein should be taken 45-60 minutes before bed. Can be served hot or cold.

Directions for Use

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. Consume cold or transfer into a cup and then heat in a microwave. Drink one hour before going to bed.


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.

Informed Sport Registered

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

Nutritional Info


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

Read More

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.


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Verified Reviews

Rated 4.4 out of 5 based on 22 Reviews
Jonathan Black

Just what I wanted and a good deal in the website


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

Mr. Joe Beer

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

Patrick Jones

Very nice and good snack

Michael Draper

Nice texture and taste


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

Paul Corney

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.

gavin arber

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

Adam Nightingale

Only used a couple of times but happy so far.


Super tasty and effective way to boost sleep recovery

Dave Thorpe

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

Michael Cassidy

Great taste, convenient.

Bashir Humphreys

Nice tasting and trusted


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


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.

Andrew Rigby

Very good for overnight recovery


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.