In 1918, US nurse Linnie Jane Kefauver led one of the first "Open-Air Hospital" programs for influenza patients on the East Coast. Care took place outdoors: sunlight, fresh air, tranquility. Women like her shaped a practice that seems surprisingly modern today: recovery through nature contact. In our always-on world, this historical lesson becomes relevant again—not nostalgically, but neurobiologically sensible. Nature moments are not a wellness gimmick but an antidote to digital overload, with measurable effects on sleep, stress, and cognitive performance.

Digital detox does not mean technological asceticism but targeted recovery windows in which the brain disconnects from constant stimuli. Central to this is the balance between digital stimulation and restorative "green" stimuli. Nature contact has been shown to activate the parasympathetic nervous system, responsible for relaxation, and promotes heart rate variability (HRV)a measure of the adaptability of the autonomic nervous system. At the same time, natural stimuli defuse "cognitive competition": screens require constant attention shifts, while natural scenarios evoke so-called "soft fascination"—enough stimulation to maintain interest without overloading working memory. Terms like circadian rhythmthe internal 24-hour cycle of sleep, hormones, and performance and biophilicattuned to the innate connection to nature are not just theoretical here, but levers for energy, focus, and long-term health.

Excessive screen time disrupts sleep and increases stress—especially in the evenings. A review shows that blue light and psychological factors like FOMO shift melatonin release, delay sleep onset, and impair sleep quality; this affects cognition, immune function, and weight ^[1]. The longer the screen time, the more frequently physical complaints such as headaches, neck pain, eye strain, and sleep problems occur; social media and browsing times are particularly strongly linked ^[2]. When eating, parallel smartphone use promotes distraction-related overeating and disturbed postprandial responses, even though field studies remain heterogeneous ^{[3] [4] [5]}. Socially, being constantly online paradoxically feels isolating: students report feeling "surrounded yet unseen," late-night scrolling leading to sleep loss and increased rumination ^[6]. In contrast, exposure to nature shows acute reductions in stress markers, improved mood, and sleep-promoting effects—the exact counterweights that high performers need ^{[7] [8]}.

Two lines of research are particularly actionable. First: Nature-based interventions. In a quasi-experimental study on "Forest Bathing," saliva cortisol levels dropped significantly more than during urban control walks; additionally, systolic blood pressure and anxiety-stress symptoms were significantly reduced within the forest group. The relevance lies in the acute benefits: a single session can dampen physiological stress—scalable as a weekly routine ^[7]. A wearable-based observational study among students specifies the dose: single sessions of about 17–35 minutes were associated with better sleep parameters, approximately three nature contacts per week with improved daily functioning, and 70–120 minutes per week with emotional improvements and favorable HRV patterns. For daily life, this means: short, regular windows in nature outperform rare marathons ^[8]. Second: Digital overload as a risk factor. A large-scale student survey links longer screen time—especially social media—with more somatic complaints and sleep problems; the correlation remains even after sociodemographic adjustments ^[2]. Additionally, a narrative review shows that evening smartphone use disrupts the circadian rhythm through light and psychological activation, thereby undermining cognitive performance and metabolic health ^[1]. Taken together, these findings outline a clear strategy: reduce evening screen time, replace it with brief nature moments—measurable effects are likely.

- Schedule fixed 30 minutes in nature during weekdays (park, waterfront, campus avenue). Goal: 3–4 sessions per week and a total of 70–120 minutes. This contributes positively to sleep, daily functioning, and HRV ^[8]. Bonus: Use "Forest Bathing" principles—slow walking, sensory focus—to reduce acute stress ^[7].
- Use weekends as regeneration boosters: a day trip to near forests or lakes. Nature-based activities (light hiking, paddling, winter trails) correlate with higher psychological well-being and resilience—especially with regular participation ^[9].
- Practice mindfulness in nature: 10–15 minutes of breathing or walking meditation in the park. Nature-based mindfulness programs reduce stress, anxiety, and rumination while improving sleep and self-regulation ^[10].
- Make the office biophilic: place your desk by a window, include plants (e.g., Spathiphyllum, Ficus) in the field of vision. Studies show better mood and potentially more efficient neural processing during cognitive tasks; natural light stabilizes the circadian rhythm ^[11].

Future progress will come from precise dosing: wearables allow for individual “nature recipes” based on target parameters such as sleep, HRV, or mood ^[8]. Simultaneously, studies are needed that combine digital hygiene with nature interventions to robustly quantify additive effects on stress axes and metabolic markers ^{[7] [1]}.