Research links stress to weekend illness and night‑time sleep decline after age 40

Scientists have identified a pattern of illnesses that appear more frequently on weekends and holidays, termed “holiday disease.” Dutch psychologist Ad Vingerhoets first described the condition in 2001, estimating that about 3 % of the Dutch population experiences it, with symptoms such as headaches, muscle pain, fatigue and flu‑like infections. Follow‑up studies suggest that prolonged work‑related stress lowers immune resistance, making the body more vulnerable to illness during periods of relaxation.

Separate research explains why sleep quality deteriorates for many people after the age of forty. Hormonal fluctuations during perimenopause cause hot flashes and night sweats that disrupt deep‑sleep phases, while higher cortisol levels from chronic stress further impair the ability to fall back asleep after awakenings. Experts recommend cooler bedroom temperatures, regular sleep schedules and moderate evening exercise to improve night‑time regeneration.

Both lines of research highlight the impact of stress and lifestyle changes on health, emphasizing preventive measures to maintain immunity and sleep quality.