Screen Time and Sleep: What the Research Actually Shows

Adults in Caracas are averaging fewer than six hours of sleep per night, according to a 2025 regional wellness survey conducted by the Universidad Central de Venezuela's public health faculty. The culprit most commonly cited by respondents: phone use in bed. But the relationship between screens and sleep is messier than the usual advice — put the phone down, buy blue-light glasses, charge your device in another room — tends to suggest.

Hormones are central to the story. Research published in the journal Sleep Medicine Reviews in late 2024 confirmed what sleep scientists have argued for years: blue-spectrum light emitted by phones and laptops suppresses melatonin production, the hormone that signals to your body it is time to wind down. The suppression begins within roughly 30 minutes of exposure and can delay sleep onset by 90 minutes or more. In a city like Caracas, where social life routinely extends past 10 p.m. and power outages have historically pushed evening activity onto battery-powered screens, those 90 minutes matter enormously.

The Local Picture

The Clínica El Ávila, located near the Francisco de Miranda highway in the east of the city, has seen a sharp uptick in patients presenting with chronic insomnia complaints since 2023, according to publicly available hospital reporting data. Staff at the clinic's wellness unit have attributed a significant portion of cases to irregular sleep-wake schedules driven by late-night scrolling. Separately, the Centro Médico de Caracas on Avenida Eraso in San Bernardino began offering a structured sleep hygiene consultation program in January 2026, a six-session course priced at around 80 USD for private patients, with sliding-scale options for those referred through affiliated community clinics.

Caracas gyms and wellness studios have picked up the thread too. La Trinidad-based studio Alma Wellness, which runs morning yoga and breathwork sessions starting at 6 a.m., began distributing printed sleep-hygiene guides to members earlier this year after instructors noticed clients arriving visibly exhausted despite early bookings. The guides, developed in partnership with a nutritionist based in Las Mercedes, include a specific section on screen-free wind-down routines — something that would have seemed unnecessary to include even three years ago.

What the Evidence Does — and Doesn't — Say

The blue-light narrative is real, but researchers caution against treating it as the whole story. A study from Harvard Medical School, published in February 2025, found that the psychological stimulation of content — doomscrolling news, watching tense drama, engaging in WhatsApp arguments — raised cortisol levels independently of light exposure. In other words, switching your phone to night mode does not solve the problem if you are reading stressful content. The content itself is a sleep disruptor.

There is also the question of displacement. Every hour spent on a phone after 10 p.m. is, mechanically, an hour not sleeping. The 2025 UCV survey found respondents in Chacao and Baruta municipios were on their devices an average of 2.3 hours after midnight on weeknights. The melatonin suppression compounds the displacement. You stay up longer, your melatonin window shifts, and waking at 6 a.m. for work means the debt accrues across the week.

Blue-light blocking glasses do reduce some light-spectrum exposure, but the scientific consensus — including guidance from the American Academy of Sleep Medicine updated in 2025 — holds that no glasses substitute for reducing screen time itself in the hour before bed. A pair of marketed blue-light frames sold in several Sabana Grande optical shops runs between 35 and 120 USD. They are not a solution on their own.

The practical picture for Caraqueños is straightforward, if not easy. Setting a hard cutoff for screens at 10:30 p.m., keeping phones out of the bedroom, and replacing the pre-sleep scroll with something non-digital — reading, stretching, conversation — closes the melatonin window on schedule and improves sleep onset without requiring any purchases. Anyone experiencing persistent insomnia, daytime fatigue, or difficulty falling asleep for more than three weeks should speak with a physician or sleep specialist at one of Caracas's accredited health centres rather than self-diagnosing. The research is clear enough. Acting on it is the harder part.