Anahana
Understand Your Physical Wellbeing
Explore guides on sleep, pain, body systems, hormones, movement, and everyday physical wellbeing.
Start with the basics
Use the pillar guide to understand the main areas covered across physical health.
Read overviewProgressive Muscle Relaxation
Follow a gentle sequence of tensing and releasing muscle groups with your attention.
Try the practicePhysical health guides people are exploring
Your path
- Sleep
Sleep science
The section's own overview of sleep — cycles, stages, and what affects them.
Poor sleep and pain often reinforce each other; this page covers the sleep half of that link.
Touches on several body systems involved in regulating sleep.
Covers the hormonal side of sleep regulation, alongside cortisol's own page.
An overview of sleep: cycles, stages, and what commonly disrupts it.
- Neuroplasticity
Neuroplasticity
Sleep is one of the conditions most closely tied to the brain's capacity to change.
Relevant to chronic pain, where the nervous system's own adaptability plays a role.
Concerns the nervous system's own capacity to reorganize itself.
Touches on how stress hormones can affect the brain's adaptability over time.
The brain's capacity to reorganize itself in response to experience.
- What is Inflammation
Inflammation
Poor sleep is one of the factors traditionally linked to higher inflammation.
Inflammation is a common thread running through many of the pain pages here.
Involves the immune system directly, alongside the systems most affected by it.
Chronic inflammation and stress hormones are traditionally read as related.
What inflammation is, and the difference between its short-term and chronic forms.
- Cortisol
Cortisol
Cortisol's daily rhythm is closely tied to sleep timing and quality.
Chronic pain is one of the stressors that can keep cortisol elevated.
Produced by the endocrine system, with effects across several others.
The section's own core hormone page — what cortisol does, and what affects it.
Often called the stress hormone — what it does, and what affects its levels.
- Flexibility
Flexibility
Not closely tied to sleep — its overlap here is looser than the other pages.
Limited flexibility is a common contributor to several pain conditions covered elsewhere.
Concerns the musculoskeletal system specifically.
Not a hormone-driven topic in the way the other pages here are.
What affects flexibility, and practical ways to work on it over time.
- Immune System
Immune System
Sleep quality is one of the more consistently cited influences on immune function.
The immune system's role in inflammation connects it to several pain conditions.
The section's own body-systems overview, alongside circulatory, endocrine, and others.
Immune function and hormone levels are closely, and often bidirectionally, linked.
How the immune system works, and what commonly supports or weakens it.
Browse practical guides across sleep, pain, body systems, hormones, and general wellbeing.
Browse all Physical Health guides
See every physical health guide gathered in one place.
- Adrenaline
- Alternative Medicine
- Alzheimer's
- Back Pain
- Cardiovascular Health
- Chronic Migraines
- Chronic Pain
- Circulatory System
- Core Strength
- Cryotherapy
- Deep Sleep
- Diaphragm
- Endocrine System
- Fight or Flight Response
- Guided Meditation for Sleep
- Heart Coherence
- Heart Rate Variability
- Heat Shock Proteins
- Hormonal Imbalance Symptoms
- Hormones
- Hypertension
- Injury Prevention
- Insomnia
- Intermittent Fasting
- Kinesiology
- Limbic system
- Lower Back Pain
- Lucid Dreaming
- Migraines
- Neurobiology
- Neurodiversity
- Neurotransmitters
- Placebo
- Plantar Fasciitis
- Posture
- Progressive Muscle Relaxation
- Respiratory System
- Runners Knee
- Sciatica Stretches
- Sleep Cycle
- Sleep Deprivation
- Sleep Disorders
- Sleep Hygiene
- Sleep Inertia
- Sports science
- Strength Training
- Stress Hormones
- Stretching
- Upper Cross Syndrome
- What is Lordosis?
- What is Polyvagal theory
- What is Tennis Elbow