Sleep is the Session you’re Skipping
Sleep Is the
Session You're
Skipping.
"Every adaptation you are chasing in training — power, endurance, resilience — happens while you sleep. Not while you ride."
Most cyclists I work with are meticulous about their training load. They track TSS, monitor heart rate variability, obsess over power numbers. And then they get five and a half hours of sleep because they stayed up scrolling, and wonder why their legs feel dead three days into the week.
This is the biggest untracked variable in amateur cycling. Not nutrition. Not training volume. Sleep.
It doesn't feel like training. It feels like the absence of training — the gap between sessions. But physiologically, it is the session. It is where everything you asked of your body actually gets built.
What Actually Happens When You Sleep
When you finish a hard ride, your muscles are damaged at the fibre level. Glycogen stores are depleted. Hormonal signals are firing. Your nervous system is carrying residual fatigue from the effort.
None of that gets repaired on the couch, in the shower, or watching television. The rebuilding process — the one that makes you stronger, faster, and more resilient — is gated behind sleep. Specifically, behind deep slow-wave sleep and REM cycles.
"You do not get fitter from training. You get fitter from recovering from training. Sleep is where recovery actually happens."
During deep sleep, human growth hormone is released — the primary driver of muscle repair and adaptation. During REM sleep, the nervous system consolidates motor patterns and clears mental fatigue. Cardiovascular adaptations, mitochondrial density changes, lactate threshold improvements — all of these are downstream of sleep quality and quantity. Compress the sleep, and you compress the adaptation.
What the Data Shows
The research on sleep and athletic performance is one of the most consistent bodies of evidence in sports physiology. The findings are not subtle.
In our work with riders on the Roojai Insurance Winspace team, sleep is treated as a performance variable — not a lifestyle preference. Before major races, we build sleep protocols into the preparation block just as deliberately as training blocks. A rested athlete on moderate fitness will outperform a tired athlete on high fitness. Every time.
Why Cyclists Chronically Under-Sleep
It is rarely laziness. Most athletes I coach are disciplined and genuinely committed. The problem is structural — and comes from how they think about time.
Training Time
The morning ride, the evening session, the weekend long ride. Non-negotiable. Everything else gets squeezed around them — including sleep.
Sleep Time
Late nights, early alarms, scrolling before bed. Sleep is treated as the flexible variable. It is the most important variable you are cutting.
The mental model is wrong. Training is the stimulus. Sleep is the adaptation. If you protect the stimulus at the expense of the adaptation, you are not getting stronger — you are accumulating fatigue and suppressing the very changes you are training for.
If you are getting fewer than 7.5 hours of sleep consistently, you are not fully adapting to your training. More training will not fix this. Better sleep will.
Five Things Worth Doing Tonight
Set a Consistent Bedtime — Not Just a Wake Time
Most people set an alarm to wake up but go to bed whenever. Reverse this. A consistent bedtime anchors your circadian rhythm far more effectively than a consistent wake time. Pick a time and protect it like a training session.
No Screens in the 30 Minutes Before Bed
Blue light from phones and tablets suppresses melatonin production for up to two hours. You do not need blackout curtains or sleep supplements. You need to put the phone down. This single change will improve your sleep onset and quality more than any supplement on the market.
Cool Your Room Down
Core body temperature needs to drop 1–2°C to initiate deep sleep. A cool room — 18–20°C — accelerates this. In Bangkok, this means using air conditioning deliberately, not because it's hot outside, but because your recovery depends on it.
Treat the Night Before a Hard Session as Part of the Session
You wouldn't show up to a race without fuelling properly. Apply the same thinking to sleep. The night before your hardest training day is not the night to stay up late. Eight hours before a hard session is as important as your warm-up.
Track It for Two Weeks
Most athletes have no idea how much sleep they are actually getting — they guess, and they guess high. Track it for two weeks with any wearable or phone app. The gap between estimated and actual sleep is almost always a wake-up call.
The Simplest Upgrade Available to You
If you are trying to improve as a cyclist and you are not sleeping at least seven to eight hours consistently — you are leaving the single largest performance gain on the table every single night.
No supplement, training method, or marginal gain compounds the way sleep does. It is the foundation that everything else sits on. Get it right, and everything else works better. Get it wrong, and nothing else can compensate.
"The best training session of the week is the one that follows a perfect night of sleep. Everything else is a discount on the full price."
Start there. Not tomorrow — tonight.