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The Power of Sleep for Better Performance and Health

This January, let's focus on an often-overlooked yet vital aspect of our wellbeing - sleep hygiene. A good sleep regime is crucial for physical, mental, and emotional health and can significantly enhance CrossFit performance. This post will delve deeper into the research supporting the numerous benefits of better sleep and examine simple ways to improve your sleep hygiene.

Benefits of Improved Sleep Hygiene.

Sleeping well can have an incredible impact on our overall health and wellbeing. Research has shown that improved sleep hygiene offers various benefits:

  • 1. Better cognitive function and decision-making: A well-rested mind is more focused and able to process information quickly and accurately. According to research, sleep is critical in cognitive functions like memory consolidation, learning, and problem-solving 1.

  • 2. Improved mood: Adequate sleep is essential for emotional regulation and positive mood. Studies have shown a strong correlation between poor sleep quality and increased risk of anxiety and depression 2.

  • 3. Lower stress levels: Quality sleep helps us manage stress and cope with daily challenges. Research has demonstrated that sufficient sleep can lower cortisol levels, reducing stress [^3^].

  • 4. Enhanced recovery from training: Proper rest is critical in muscle growth, cardiovascular fitness, and joint health. Studies suggest that adequate sleep is crucial for protein synthesis, tissue repair, and the release of growth hormone, all contributing to better recovery [^4^].

  • 5. Better fat loss: Good sleep helps reduce cravings and control calorie intake, aiding weight management. Research indicates that sleep deprivation can lead to increased ghrelin (the hunger hormone) and decreased leptin (the satiety hormone), leading to overeating and weight gain [^5^].

  • 6. Stronger immune system: Sleep contributes to a robust immune system through various mechanisms. Studies have shown chronic sleep loss can weaken the immune system and increase infection susceptibility [^6^].

  • 7. Reduced risk of long-term health issues: Sleep promotes overall health and lowers the risk of developing chronic conditions. Research has linked poor sleep with an increased risk of heart disease, obesity, and type 2 diabetes [^7^].

Tips for Better Sleep Quality

To improve your sleep quality and reap these benefits, follow these simple suggestions based on sleep research:

  • 1. Limit screen time before bed: Avoid screens (including phones, tablets, and TVs) for at least an hour before bedtime. The blue light emitted from these devices can suppress the production of melatonin, a hormone responsible for regulating sleep [^8^].

  • 2. No caffeine after 4 pm: Caffeine can interfere with sleep because it blocks sleep-promoting adenosine receptors. Studies have shown that caffeine ingested even six hours before bedtime can disrupt sleep [^9^].

  • 3. Aim for 8 hours of sleep: Most adults require between 7 and 8 hours per night for optimal health. Research has demonstrated that short and long sleep durations increase mortality [^10^].

  • 4. Stay hydrated during the day: Drink enough water throughout the day and minimize fluid intake before bedtime. This strategy can help prevent nighttime interruptions in the bathroom and ensure better-quality sleep [^11^].

  • 5. Eat enough carbohydrates on training days: Proper nutrition, including carbohydrates, can support better sleep and recovery. Studies have found that consuming carbohydrates in the evening can facilitate the release of serotonin, converted into melatonin, contributing to better sleep [^12^].

Tracking Your Sleep

Monitoring your sleep can increase awareness and help you make valuable improvements. You can use various methods to track your sleep, such as:

  • Downloading a sleep tracking app (ranging from £3-£8 a month)

  • Writing down your sleep hours in a journal

  • Using a fitness watch that offers sleep-tracking features

Remember, this is not a competition - it's about understanding your sleep habits and working on them to improve your overall health and CrossFit performance. Remember that some factors will be out of your control, such as young children or shift work. Feel free to discuss these concerns or reach out with any questions.

Let's commit to prioritising sleep this January and embrace the countless benefits good sleep hygiene brings!


  1. Walker, M. P. (2008). Cognitive consequences of sleep and sleep loss. Sleep Medicine, 9, S29-S34. 

  2. Baglioni, C., Battagliese, G., Feige, B., Spiegelhalder, K., Nissen, C., Voderholzer, U., ... & Riemann, D. (2011). Insomnia as a predictor of depression: a meta-analytic evaluation of longitudinal 

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