SiS Overnight Protein

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SiS Overnight Protein

SiS Overnight Protein is made from high quality milk protein for a great taste and trusted source of protein. The product formulation provides a source of slowly digesting protein to provide a pool of amino acid to support lean muscle growth and maintenance as you sleep.

Each serving contains 26-27g of protein per serving, depending on the flavour you choose. The milk protein contains the same ratio of fast and slow release proteins as found naturally in milk. 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. The formulation has low levels of carbohydrate and fat.

Sleep is one of the most important aspects of recovery and is often unappreciated by many athletes. Regularly feeding protein every 3-4 hours in servings around 25g is the best way to support the growth and maintenance of lean muscle mass. Feeding during the night is obviously very difficult so taking a slow release protein before bed allows quality sleep and quality protein delivery to maximise your training adaptations.

During times of high volume training it can be difficult to avoid negative energy balance. Taking protein prior to bed reduces the likelihood of lean muscle mass breakdown to supply energy during the night.

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    SiS Overnight Protein


    • Slowly digested milk protein
    • Maintains muscle mass while you sleep
    • High in protein
    • Fuelling gold medal winners since 1992

    Serving Information

    • Container Size: 1000 g
    • Serving Size: 35 g
    • Servings Per Container: 28

    Nutritional Information (based on Chocolate Flavour)

    • Energy: 550 kJ / 130 kcal
    • Protein: 26 g
    • Carbohydrate: 1.9 g
      • of which Sugars: 0.7 g
    • Fat: 2 g
      • of which Saturates: 1.2 g
    • Fibre: 1.1 g
    • Salt: 0.3 g


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

    Recommended Use

    • Add 35 g to 250 ml of water in an SiS Protein Shaker Bottle.
    • Shake well ensuring the lid is firmly closed.
    • Can be consumed cold or hot - If you prefer hot, transfer the mixture into a suitable cup and heat for 70 seconds in a microwave (700W), cooking times may vary. Stand for 1 minute after heating and then stir.
    • Consume one serving 45-60 minutes before sleeping.

    Allergen Information

    • Contains milk, soy.

    SiS Overnight Protein review


    Seems to work

    Review posted on 15 May 2014

    It's hard to say, if this product really works, or if it's all the placebo effect. However, I seem to have less muscles soreness the day after I have been out running/biking, when I use this product. The downside to this product is its taste. I got the vanilla flavored one, and it's drinkable, but still quite synthetic.

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    Great product, fits the daily routine

    Review posted on 25 Jan 2014

    This stuff tastes quite good... a bit chemically but easily consumed. Tastes quite good as a hot drink just before bed. Not sure of any real performance gains yet but have definitely noticed more lean mass, not feeling so hungry with a noticeable change in muscle shape. I'd recommend this as a supliment to most active people who need that bit more protein in the daily diet. The results will be more apparent come race season.

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    Helps me sleep

    Review posted on 08 Sep 2013

    Knocks me out about an hour after taking. Great stuff

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    Review posted on 16 Aug 2013

    Not sure if it works, but tastes nice even hot as bedtime hot chocolate

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    Review posted on 30 Jan 2012

    When I bought this I wanted something to have at night time without the full liquid intake of a protein shake, and with some night time specific ingredients. It's okay; it does the job, but I'm not sure if I sleep any better for it, and taste wise it is drinkable but not moreish (I have warmed mine as suggested, not tried it cold). Overall, acceptable for what it is.

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