Screen time and sleep: what the research actually shows

A 2025 University of Queensland analysis of 1,200 adults found that screen exposure within 60 minutes of bedtime delayed sleep onset by 42 minutes on average and cut total sleep time by 34 minutes.

Device use has climbed in Far North Queensland since remote work expanded after 2022, leaving more residents in the Cairns CBD and Edge Hill checking phones late after shifts at Rusty's Markets or post-snorkel sessions on the Great Barrier Reef. The pattern hits harder during the dry season when daylight lingers past 6pm and people extend evenings on the Esplanade.

Local patterns in Cairns

Cairns Base Hospital's sleep clinic on The Esplanade recorded a 19 percent rise in referrals for insomnia between 2023 and 2025, with staff noting frequent reports of blue-light habits among patients from Manoora and Westcourt. A separate initiative run by Cairns Regional Council at the Civic Centre on Spence Street now offers free workshops on digital wind-down routines tied to local hiking groups that tackle Atherton Tablelands trails on weekends.

Key evidence and numbers

The Queensland study measured melatonin suppression through saliva samples and wrist actigraphy, showing levels dropped 23 percent after one hour of smartphone use at 80 percent brightness. Australian Bureau of Statistics data from the same year put average daily screen time for adults at 6.4 hours, with 41 percent of that occurring after 8pm in regional centres including Cairns. Replacement costs for basic blue-light blocking glasses at local pharmacies on Grafton Street start at $29.

Residents can shift phone settings to night mode by 8:30pm and swap late scrolling for a 10-minute walk along the Esplanade or a produce run at Rusty's Markets the next morning. Cairns Base Hospital staff recommend tracking sleep for one week with a simple notebook before adjusting routines, then consulting the sleep clinic if delays persist beyond 30 minutes on most nights.