Examination of the effects of natural light illumination on the autonomic nervous system, sleep, and ocular blood flow: Contrast with artificial light LED illumination

Status

Active, not recruiting

Phases

Unknown

Study type

Interventional

Source

JPRN

Registry ID

JPRN-jRCT1020230033

Enrollment

Registered

2023-11-07

Start date

2023-11-07

Completion date

Unknown

Last updated

2026-06-29

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

Conditions

Homo sapiens LED Lighting

Interventions

The inspection will be conducted in a room with general LED lighting and a room with natural LED lighting that imitates sunlight, each for one night and two days.

LED Lighting

Eligibility

Sex/Gender

All

Inclusion criteria

Inclusion criteria: (1) Japanese healthy persons over 40 years old (at the time of registration) with no previous medical history (2) Any gender (3) BMI: 18-25 kg/m2 (4) Living environment: not engaged in night work (5) Able to stay overnight for two nights on two occasions.

Exclusion criteria

Exclusion criteria: (1) Patients with psychosis or psychiatric symptoms that make it difficult for them to participate in the study (2) Those who regularly take drugs, supplements, or other nutritional supplements that affect sleep. (3) Those who are not engaged in late-night work.

Design outcomes

Primary

Measure	Time frame
Autonomic nervous system, sleep, ocular blood flow	—

Contacts

Public ContactIshikawa Makoto

Tohoku University Hospital

makoto.ishikawa.c2@tohoku.ac.jp+81-22-717-7294

Outcome results

None listed

Source: JPRN (via WHO ICTRP) · Data processed: Jul 3, 2026