Beat the Winter Darkness: Simple Fuelling and Habit Tweaks to Make Morning Training Easier

For many endurance athletes, early morning training sessions are an essential part of their routine, whether it’s the only time available or the safest window for a long session before a hectic day.
But when those mornings start before sunrise, that commitment can feel less heroic and more impossible. Cold air. Pitch-black surroundings. A body that feels like it’s still asleep. Not exactly the recipe for a confident, energised session.

The good news? There are ways to make those dark morning workouts not just doable, but genuinely enjoyable, and your nutrition strategy is one of the strongest tools you have.

Our guide will get your body and brain on board for those pre-dawn miles. With practical tips, a deeper look at circadian physiology, and smart ways to use Science in Sport products to support your morning training.

Why Dark Morning Workouts Feel Harder in the First Place

Before we fix the problem, we need to understand why early morning sessions feel so tough. A large part of the challenge comes down to circadian biology: the internal clock that governs everything from hormone release to core temperature, alertness, digestion, and neuromuscular readiness.

1. Your body temperature is lowest in the early morning

Core body temperature naturally dips overnight and doesn’t begin rising until closer to sunrise. A lower temperature is associated with:

– Slower reaction times
– Reduced muscle contractility
– A perception of greater effort
– A higher risk of feeling stiff or sluggish

This is why the first few minutes of a sunrise workout can feel like you’re running through the cement.

2. Cortisol and melatonin are still crossing paths

Your cortisol awakening response (CAR) ramps up sharply about 30-45 minutes after waking. Before that, your body still has lingering melatonin circulating.
That hormonal overlap can leave you feeling foggy and mentally unprepared.

3. Glycogen availability is slightly reduced

Depending on your previous night’s dinner and any nocturnal fast, your liver glycogen stores may be somewhat depleted. While muscle glycogen hasn’t dramatically changed, liver glycogen is key for blood glucose stability, especially in the first minutes of a run.

4. Psychological resistance is higher before sunrise

Darkness cues the brain towards “rest” rather than “action”. Studies in chronobiology show that light exposure is one of the biggest external cues for wakefulness. Without sunlight, motivation is harder to access.

Understanding these factors helps you approach morning workouts strategically instead of feeling like something is ‘wrong’ with you. Nothing is wrong. Your body simply needs the right inputs.

Prime Your Body For Early Training

Morning success is about what you do the night before.

1. Build a consistent sleep pattern

A 6 AM workout feels a lot different if you’ve slept 7.5 hours vs. 5 hours. Athletes aiming for early sessions benefit from a consistent bedtime, a routine that avoids screens in the hour before sleep, and light exposure earlier in the day.

Because circadian rhythms adjust slowly, going to bed early once won’t make the morning drastically easier. Aim for consistency.

2. Eat a carbohydrate-rich dinner

This supports liver glycogen replenishment, which is crucial for maintaining stable morning blood glucose before your session starts.

Great evening options:

• Rice or pasta bowls
• Potatoes or sweet potatoes
• Whole-grain wraps
• Carbohydrate-rich soups (lentil, noodle, bean-based).

Carbs at dinner aren’t just allowed; they’re smart for performance.

3.  Prep your gear before bed

Set out:

• Shoes
• Clothing layers
• Watch and headtorch
• A pre-run carb source
• Your intra-run fuelling products

Making the morning as frictionless as possible reduces decision fatigue, which is one of the biggest barriers to early training.

The First 10 Minutes After Waking Up: Your Performance Warm-Up Window

This short window can be a complete game-changer for alertness.

1. Turn on a bright light immediately

Artificial bright light boxes, overhead lighting, or even just multiple lamps can rapidly suppress melatonin and cue wakefulness. It also triggers the cortisol awakening response.

2.   Hydrate as soon as your feet hit the floor

Even mild overnight dehydration increases perceived exertion. Aim for 300–500 ml of fluid within the first 10 minutes of waking.

A great option here is SiS HYDRO Tablets; they provide electrolytes without carbs, and start waking up your neuromuscular system.

Electrolytes early in the morning can improve fluid absorption and prime the gut for digesting carbs just before your run.

3.   A small dose of caffeine if you tolerate it

Caffeine increases dopamine and alertness, and morning doses feel more effective when melatonin is still tapering off.

SiS GO Energy + Caffeine Gels are a great alternative to a morning coffee. They remove the feeling of liquid sloshing around in your stomach, you don’t have to wait 45 minutes for caffeine absorption, and they’re a low-fibre option.

The caffeine gel absorbs quickly and delivers both carbohydrate and alertness – perfect for early sessions.

A Simple Pre-Run Fuel Strategy That Makes Morning Workouts Feel Easier

Many athletes under-fuel their morning workouts because their appetite is low or time feels limited. But research consistently shows that carbohydrate before exercise improves perceived exertion, power output, and endurance, even in sessions under 60 minutes.

You don’t need a full meal. You just need some fuel to power you through those miles.

Most endurance athletes aim for:

• 0.5-1.0g/kg of carbs for sessions <60 minutes
• 1.0-2.0g/kg of carbs for sessions lasting 60–90 minutes
• 1.0-2.0g/kg of carbs for 90+ minutes (plus intra-run fuel)

Quick, low-fibre, easy-digesting morning options:

• A banana
• A slice of toast with honey
• White rice cakes 
• SiS GO Isotonic Energy Gel
  • No water neededAbsorbs quicklyEasy on the stomach

Taking one gel 5–10 minutes before leaving the house can dramatically reduce that “slow and empty” feeling in the first 15 minutes of your session.

If you struggle with appetite immediately after waking…

Try fuelling during the first 5–10 minutes instead. Isotonic gels allow this without nausea.

Warm-Up Strategies to Switch From “Cold and Stiff” to “Ready to Roll”

A dark morning body is a slow body until you wake it up intentionally.

1.   Raise your core temperature fast

Your muscles function better when warm. Start with:

• 2 minutes of brisk walking indoors
• 5–8 minutes of easy running or dynamic drills outside
• Light activation: glute bridges, calf raises, leg swings

Even 3–4 minutes of dynamic movement increases neuromuscular speed.

2.   Layer strategically

A base layer + a breathable mid-layer + gloves can keep you warm without overheating. Remember:

Your perception of effort is higher when you’re cold.

Gloves matter more than you think: warm hands reduce the “shock” feeling.

3.   Start your watch, but don’t start your workout

Give yourself a “warm-up buffer zone” between waking up and hitting your structured session. A gentle 5–10 minutes can completely shift your physiological readiness.

Intra-Run Nutrition: Keep Energy Rolling

If your morning workout is longer than 60-90 minutes, fuelling during the session becomes just as important as fuelling before it, especially with your body coming off an overnight fast.

To keep energy high and maintain stable glucose, aim for:

• 45–60g carbs per hour (moderate-intensity sessions)
• 60-90g carbs per hour (higher intensity or longer runs)

Ideal options:

• SiS GO Isotonic Gel (22g carb; no water needed)
• SiS BETA Fuel Gel (40–50g carb for high-carb sessions)
• SiS GO Energy Drink (combines carbs + electrolytes)

Athletes often report that incorporating carbs early in a morning session helps:

• Prevent the early “dip” in energy
• Improve pace stability
• Reduce mental fatigue
• Support gut training for race season

Even if you don’t feel hungry, your muscles will thank you.

The Psychology of Dark Morning Training: How to Make It Mentally Easier

You can optimise physiology perfectly and still not want to run in the dark. Motivation is its own science. Here are ways to make it mentally more doable:

1.   Use environmental cues

• Lay out your running clothes the night before
• Charge your watch and place it by your bed
• Keep your headtorch and shoes by the door

Environmental priming takes discipline out of the equation.

2.   Build a “wake-up playlist.”

Music stimulates dopamine and reward pathways, making the idea of getting out the door more appealing. Choose songs that feel warm, upbeat, or energising.

3.   Reward the process, not the outcome

Instead of focusing on the workout itself, focus on the reward:

“That first sip of hot coffee after I finish.”
“A warm shower.”
“A feeling of accomplishment before 7 am.”

Small rewards create big motivation loops.

4.   Find early morning workout buddies

Even if virtual, knowing someone else is also out there makes the session feel communal.

5.   Reframe the narrative

Dark morning workouts aren’t a punishment; they’re a superpower. You’re training when most people are sleeping. You’re building discipline, consistency, and resilience that will show up in races when conditions aren’t perfect.

Post-Run Recovery: The Step Athletes Often Skip on Busy Mornings

Early workouts usually mean a rushed morning. But skipping recovery nutrition is one of the fastest ways to accumulate fatigue and compromise performance later.

Aim for:

• 20–30g protein
• 1-2 g/kg carbs
• Electrolytes

Great post-run options:

• Eggs + toast
• Greek yogurt + fruit + granola
• Smoothie with banana + protein + oats
• Oatmeal with whey and berries

Science in Sport’s REGO Clear Recovery Powder is a good back-up on rushed mornings. It contains 21g of carbohydrate and 20g of protein, which helps jump-start glycogen replenishment and is a convenient way to replenish when your appetite is depleted.

Pairing this with an easy breakfast an hour later keeps you fuelled for the rest of the day.

Building a Sustainable Morning Training Routine

The key is not perfection. It’s predictability.

A simple weekly structure can help:

• 2–3 early workouts per week, balanced with more flexible mid-day or evening sessions
• 1–2 lighter mornings where the goal is movement (easy run, mobility, short spin)
• Planned higher-carb dinners before early long runs
• Consistent SiS fuelling routines so gut tolerance improves over time

Morning training gets easier when:

• Your circadian rhythm adapts
• Your gut adapts
• Your mindset adapts
• Your environment supports you
• Your glycogen and hydration are managed intentionally

Dark mornings might never feel natural, but they can feel doable, empowering, and even enjoyable.

Morning Workouts Are Less About “Willpower” and More About Strategy

Endurance athletes often assume that people who thrive in early workouts have more discipline. But in reality, they have a better system.

When you align your routine with physiology (light exposure, carbohydrate availability, hydration, temperature, and mental cues), the difference is astonishing. What once felt impossible becomes your norm.

And with smart nutrition strategies, especially fast-acting carbohydrates like SiS Isotonic Gels, electrolytes from SiS HYDRO Tablets, or a pre-run boost from a SiS Go Energy + Caffeine Gel, you can support your body exactly when it needs it most.

Dark mornings will always be an aspect of your training schedule, but with the right fuelling plan, they don’t have to hold you back. They can become one of the most powerful tools in your training toolbox.