Why does sleep matter for training?
You do the session in the gym. You get the benefit in bed. Sleep is where your body repairs, rebuilds and resets, and nothing else you do can stand in for it. Busy people treat sleep as the thing that gives when the diary is full. It is the wrong place to save time.
- Health and mood. Good sleep supports your immune system, regulates the hormones that run your day and steadies your mood.
- Recovery and muscle. Deep sleep is when growth hormone peaks and muscle is repaired. Cut it short and you keep the fatigue from training without all of the adaptation.
- Body composition. Short sleep pushes up hunger and cravings. If fat loss is the goal, sleep is part of the plan.
What stops you sleeping well?
| The barrier | The fix |
|---|---|
| Screens | Digital curfew. No screens for the last 45 to 60 minutes. Light from phones holds back melatonin, and the content keeps your brain switched on. Need your phone on? Use sleep mode. |
| Alcohol | Drink less, earlier. It helps you nod off, then breaks up the second half of the night and cuts the deep stages. |
| Caffeine | Caffeine curfew. Stop around eight hours before bed. |
| Room and routine | Control the controllables. Set up the room, and run the same wind-down every night. |
How late can I drink coffee?
Caffeine has a half-life of around five hours. Half of a 3pm coffee is still working at 8pm, and a quarter of it at bedtime. Stopping around eight hours before bed is a good rule; the caffeine calculator shows how much is still in you at lights out.
What is the best bedroom temperature for sleep?
Most people sleep best somewhere around 16 to 20°C, because your body needs to drop its core temperature to fall asleep. Beyond that, the room should do one job: cool, dark (blackout blinds or an eye mask), quiet (white noise masks what you cannot control), comfortable and clear, with the phone out of reach if you can.
What is a good bedtime routine?
Work back from the time you need to get up and allow 8 to 9 hours in bed. That is your bedtime. The hour before it is a bridge from the day to sleep:
| When | Do this | Why |
|---|---|---|
| 60 min before | Dim the lights | Tells your brain the day is ending. |
| 45 min before | Screens off | Lets melatonin rise on time. |
| 40 min before | Something calm | Read, stretch, gentle yoga, music. |
| 30 min before | Warm bath or shower | You cool down afterwards, and falling core temperature helps sleep. |
| 10 min before | Herbal tea and a gratitude journal | A caffeine-free ritual, and the day put down on paper. |
| Bedtime | Into bed, breathe | 4-6-8 breathing, then lights out. |
4-6-8 breathing. Breathe in through your nose for 4, hold for 6, breathe out through your mouth for 8. Repeat 3 to 6 times.