The Importance of Sleep

The importance of sleep is often overlooked. Sleep is not passive!

 It is one of the most biologically active and essential processes in the body.

While we sleep, the brain and body move through highly regulated stages, each with distinct and critical functions.

What actually happens during sleep?

Sleep is broadly divided into non-REM (NREM) and REM (rapid eye movement) sleep.

Ø Deep NREM sleep (slow-wave sleep) is when the body focuses on:

·      physical repair

·      tissue regeneration

·      immune function

·      growth hormone release

·      restoration of energy stores

During this phase, the brain also activates the glymphatic system - a clearance system that removes metabolic waste, including beta-amyloid and other neurotoxic by-products that accumulate during the day.

Ø REM sleep, on the other hand, is more neurologically active

·      memory consolidation

·      emotional processing

·      learning integration

·      nervous system recalibration

Both are essential. Disrupt either, and you affect both physical and mental health.

Why sleep matters more than most people realise

Chronic poor sleep is associated with:

·      Increased insulin resistance

·      Dysregulated appetite (ghrelin ↑, leptin ↓)

·      Elevated cortisol

·      Impaired cognitive function

·      Increased risk of cardiovascular and neurodegenerative conditions

This is not just about feeling tired - this is about long-term physiology.

How much sleep do we actually need?

Sleep requirements vary by age:

·      Children (6–12 years): 9–12 hours

·      Teenagers (13–18 years): 8–10 hours

·      Adults: typically 7–9 hours

Many adults believe they function well on 5-6 hours. In reality, most are functioning in a state of adapted fatigue, not optimal health.

Sleep is not just about duration - but quality and rhythm

What’s important is:

·      Consistent sleep and wake times

·      Exposure to natural light in the morning

·      Reduced artificial light at night

·      A regulated nervous system

These are foundational for maintaining a healthy circadian rhythm.

Sleep is often the first thing people sacrifice - and one of the most powerful things to restore.

If someone tells me they are struggling with energy, weight, hormones, or even gut health, sleep is always one of the first places I look. Because without it, very little else works properly.

If you’re struggling with sleep, it’s rarely just about “trying harder” -it’s about understanding what is disrupting your physiology in the first place.