The Healthspan Map · Habits (Ch4) - Quick-wins
Calm rest space
Compiled by Aamir Malik, PhD, Professor of Neuroengineering at Brno University of Technology, from published studies. He is a researcher, not a physician. Last updated 21 August 2026.
What this is linked to
| Condition or system | Direction | Strength | Evidence type | What was found | Source |
|---|---|---|---|---|---|
| Anxiety | Do this | Moderate | RCT / meta-analysis | Greenspace/restorative-environment exposure lowers salivary cortisol and eases anxiety. | Twohig-Bennett & Jones 2018 (opens in a new tab) |
| Brain fog & memory | Do this | Emerging | RCT / meta-analysis | Air pollution is a recognized modifiable risk factor for cognitive decline; calm low-stimulus settings reduce cognitive load. | Lancet Commission on dementia 2024 (opens in a new tab) |
| Depression / low mood | Do this | Moderate | RCT / meta-analysis | Greenspace/nature exposure is associated with lower depression and stress-hormone levels. | Twohig-Bennett & Jones 2018 (opens in a new tab) |
| Headache & migraine | Do this | Emerging | Review / narrative | Strong odors and sensory overload can provoke migraine; a calm, low-stimulus environment helps. | Migraine trigger literature (Frontiers 2022) (opens in a new tab) |
| Insomnia / poor sleep | Do this | Emerging | Review / narrative | A wind-down buffer lowers pre-sleep cortisol/arousal; stimulus control and relaxation are core CBT-I components. | HPA-axis & insomnia (Endotext); CBT-I (opens in a new tab) |
| Insomnia / poor sleep | Do this | Emerging | RCT / meta-analysis | A wind-down buffer lowers pre-sleep cortisol/arousal; stimulus control and relaxation are core CBT-I components. | Effects of sleep hygiene education for insomnia: A systematic review and meta-analysis, Sleep Med Rev 2025 (opens in a new tab) |
| Reproductive & sexual health | Do this | Emerging | Cohort / observational | Chronic stress raises cortisol, which suppresses GnRH and reproductive-hormone output and dampens libido and sexual function. | Sleep restriction & testosterone (PMC6917985) (opens in a new tab) |
| Respiratory infections & airway health | Do this | Emerging | Review / narrative | Psychological stress raised cold risk in dose-response fashion via proinflammatory-cytokine dysregulation; stress reduction is protective. | Pittsburgh common-cold studies: psychosocial predictors (Cohen 2005) (opens in a new tab) |
| Stress | Do this | Moderate | RCT / meta-analysis | Greenspace / restorative-environment exposure lowers salivary cortisol and self-reported stress. | Twohig-Bennett & Jones 2018, Environ Res (opens in a new tab) |
The Healthspan Map is part of Fix the Floor, a book by Aamir Malik. About the book