MHM Magazine

Sleep is one of the most powerful determinants of health and wellbeing. It influences every physiological system in the body - from cardiovascular regulation and metabolic control to cognition, immune function, and mental health. During sleep, the brain consolidates learning, regulates emotions, and clears metabolic waste, while the body repairs tissue, balances hormones, and restores immune integrity. Despite this, sleep remains one of the least measured and, often, the least prioritised components of preventive healthcare. We’ve set out to change this. In October 2025, Discovery released ‘The Sleep Factor: A Data-Led Blueprint for Better Health’- a landmark analysis exploring how sleep influences every dimension of wellbeing. Drawing on data from across our ecosystem – including Discovery Health, Vitality, and Insure – the report integrates 47 million nights of sleep data from more than 105,000 members who have tracked their sleep through a smart watch or ring. By linking these sleep data to clinical, behavioural, and claims information, we’ve been able to derive one of the most comprehensive views yet, of how sleep affects health outcomes – from chronic disease risk to mental resilience and even our safety behind the wheel. The findings are unambiguous: sleep is causal and critical to good health. The architecture of sleep health: 3 core dimensions Throughout the night, the body experiences four to six sleep cycles. Each cycle lasts about 90- 120 minutes and is composed of light sleep, deep sleep, and Rapid Eye Movement (REM) sleep. An optimal night’s sleep is made up of multiple, full sleep cycles. The architecture of healthy sleep consists of 3 core elements: • Duration: Total number of hours slept - ideally seven to nine for most adults. • Regularity: Consistency in bedtime and wake-up time each day stabilises the body’s internal clock, supports every system, from metabolism to mood. • Quality : The restorative elements of sleep, measured by the time spent in deep sleep and Rapid Eye Movement (REM) sleep. - Deep sleep , which typically occurs during the first half of the night, is when the body repairs tissue, strengthens the immune system, and consolidates energy for the day ahead. - REM sleep dominates later in the night as the brain processes emotions and memories, and is essential for mental health, learning and resilience. When any of these elements By Dr Ron Whelan CEO, Discovery Health – Johannesburg THE SLEEP FACTOR: HOW BETTER REST CAN TRANSFORM PHYSICAL AND MENTAL HEALTH MHM | 2025 | Volume 12 | Issue 5 | The Sleep Factor: How better rest can transform physical and mental health MHM Issue 5 | 2025 | MENTAL HEALTH MATTERS | 17 MHM