A Cross-sectional Study on the Correlation Between Screen Usage and Sleep and Cognition in Medical Students

The Impact of Bedtime Screen Use on Sleep Quality and Cognitive Function in Medical Graduate Students: A Cross Sectional Correlation Study

Status

Not yet recruiting

Phases

Unknown

Study type

Observational

Source

ClinicalTrials.gov

Registry ID

NCT06969599

Enrollment

508

Registered

2025-05-14

Start date

2025-05-15

Completion date

2026-05-01

Last updated

2025-05-14

For informational purposes only — not medical advice. Sourced from public registries and may not reflect the latest updates. Terms

Conditions

Sleep Quality

Keywords

sleep

Brief summary

The aim of this study is to investigate the effects of screen use within one hour before bedtime on sleep quality and cognitive function in medical graduate students, and to verify the mediating effect of sleep quality between the two. The study adopted a cross-sectional observational design and planned to enroll 508 full-time medical graduate students. The primary endpoints were evaluated using the Pittsburgh Sleep Quality Index (PSQI) and standardized cognitive tests (N-back, ANT, etc.), while secondary endpoints included insomnia severity, anxiety/depression regulation, gut microbiota diversity, and the interaction between physical activity and sleep. Data collection includes questionnaire surveys (PSQI, ISI, GAD-7, etc.), cognitive task testing, and analysis of gut microbiota samples. The final result will provide scientific basis for improving the sleep and cognitive health of medical graduate students.

Interventions

DIAGNOSTIC_TESTNo intervention measures

No intervention measures

Study design

Observational model

COHORT

Time perspective

CROSS_SECTIONAL

Eligibility

Sex/Gender

ALL

Age

18 Years to No maximum

Healthy volunteers

Yes

Inclusion criteria

1. Inclusion criteria: 1. Full time medical graduate student at Southern Medical University 2. Age ≥ 18 years old 2.

Exclusion criteria

1. Have taken the following medications within the past month: antibiotics, probiotics, sleeping pills, laxatives, or intestinal cleansers, etc; 2. Serious gastrointestinal diseases (inflammatory bowel disease, Crohn's disease, gastric cancer, etc.); 3. Recently (within one month) experienced major life events (such as the death of a relative, surgery);

Design outcomes

Primary

Measure	Time frame	Description
Sleep questionnaire cognitive task	baseline	Sleep quality assessed through the Pittsburgh Sleep Quality Index (PSQI) total score,The higher the PSQI score, the more likely it is that the sleep quality is poor

Outcome results

None listed

Source: ClinicalTrials.gov · Data processed: Feb 4, 2026