Screen time and sleep: what the research actually shows

University of Tasmania researchers tracking 340 adults across southern Tasmania found that those logging more than 90 minutes of screen time after 8pm took an average 22 minutes longer to fall asleep than those who switched off earlier.

The pattern has sharpened since 2024 when hybrid work arrangements expanded across the state and pushed more evening hours onto phones and laptops in homes from Sandy Bay to Glenorchy.

Local routines around Hobart

Hobart Waterfront parkrun participants who finish the Saturday 5km loop by 8am often report cutting evening screens by an hour and substituting a short kunanyi/Mt Wellington summit walk instead. UTAS health researchers have followed the same cohort since March 2025 and noted improved sleep efficiency scores in 61 percent of the group after three months.

Battery Point residents have formed small walking circles that meet at the Salamanca Lawns before heading along the Derwent River path, a direct alternative to late-night scrolling that the same UTAS team recorded as reducing average bedtime device use from 112 minutes to 47 minutes.

Key numbers from the data

A 2025 UTAS analysis of wearable sleep trackers showed Tasmanians averaging 3.4 hours of total daily screen time in the final three hours before bed, with each additional 30 minutes correlating to a 7 percent drop in deep-sleep minutes. The study controlled for age, shift work and caffeine intake.

Residents seeking to test the findings can start with a 9pm device curfew and replace the final hour with outdoor movement near established routes such as the Hobart Waterfront or lower slopes of kunanyi. Anyone experiencing ongoing sleep disruption should consult a local GP or sleep clinic for personalised assessment.