Habit
Lower blue-enriched and bright light in the pre-sleep window.[2159,2224,2237, etc.]
Superscript reference numbers link to the Sources bibliography.
Composite Rating
Blends evidence depth, community direction, safety friction, and completeness.
Evidence Intensity
76/100
High depth from human/RCT/meta counts
Community Direction
20
Positive Lean • confidence Low
Safety Friction
11/100
Early signal from adverse/interaction markers
Data Completeness
100%
Studies 16 • mentions 4 • links 25
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Classification: add.[447,1171,2159, etc.]
Best fit: Users with long sleep latency and late-night screen use..[447,1171,2159, etc.]
Classification
Add
Evidence Tier
HIGH
Best Fit
Users with long sleep latency and late-night screen use.
Primary Focus
Sleep, Mood
Clinical Depth
Humans: 40 • RCTs: 7 • Meta: 0
Cohort / Real-World
Cohort signals: 2
Safety Markers
Adverse signals: 0 • Interactions: 0
Freshness, trend, and study timeline for this item
Status
Trend
→ Stable evidence base
Depth
40 total studies · 2 recent
Timeline
Total indexed
40
Human studies
40
Sleep signals
37
Neuropsych signals
14
Randomized trials
7
Cardiometabolic signals
3
Weighted direction score: 20 (Positive Lean)
High when replicated human meta-analysis/trial/cohort depth is present for the habit or exposure.
Total indexed
40
Human studies
40
Sleep signals
37
Neuropsych signals
14
Randomized trials
7
Cardiometabolic signals
3
Cohort signals
2
Dependency signals
1
Animal-only studies
0
In vitro / tissue
0
Meta-analyses
0
Distribution of evidence by study design strength
Evidence Strength: High
Composite of study volume, RCTs, and meta-analyses
PMID 36415902 • 2023 Feb
Evening Light Intensity and Phase Delay of the Circadian Clock in Early Childhood.
J Biol Rhythms
Open PubMedPMID 31690740 • 2019 Nov 5
Early evening light mitigates sleep compromising physiological and alerting responses to subsequent late evening light.
Sci Rep
Open PubMedPMID 39821044 • 2025 Jun
The bright and dark side of blue-enriched light on sleep and activity in older adults.
Geroscience
Open PubMedBenefit reports: 1
Adverse reports: 0
No-effect reports: 1
Mixed reports: 0
Unclear reports: 2
Signal confidence: 0.32
Benefits
Adverse
No Effect
Community confidence 0.32 with mentions: benefit 1, adverse 0, no-effect 1.
Subreddit coverage: sleep.
post • r/sleep • benefit
Im tired all the time even with perfect sleep hygiene I am pretty much at my limit here. I feel like I’m doing everything by the book but my sleep is still a mess. I fall asleep at usually 11 and get up at 9, get my morning sunlight, no bl…
Open mentionpost • r/sleep • no_effect
Red Lens Glasses for Biohacking Sleep – Real Science or Just Placebo? I've been experimenting with **red lens glasses** for the past few weeks to see if they really help with **melatonin production** and **circadian rhythm optimization**. …
Open mentionpost • r/sleep • unclear
Sick of blue light at night from ceiling fixtures. Is a dedicated "Red Mode" the answer?
Evidence Sources
PUBMED • Human lifestyle/habit literature
Counts from structured habit/exposure PubMed query set.
Outcome: Humans 40, RCT 7, meta 0, cohort 2, sleep signals 37, cardiometabolic signals 3.[2159,2224,2237, etc.]
Open sourcePUBMED • 2023 • Human evidence curation set
PMID 36415902 from J Biol Rhythms.
Outcome: See linked PubMed abstract for methods and outcomes.[, etc.]
Safety adverse signals
0
PMID 28597081 • 2017 Aug
Effects of bright and blue light on acoustic reaction time and maximum handgrip strength in male athletes: a randomized controlled trial.
Eur J Appl Physiol
Open PubMedPMID 27539026 • 2016 Jul
Two hours of evening reading on a self-luminous tablet vs. reading a physical book does not alter sleep after daytime bright light exposure.
Sleep Med
Open PubMedPMID 2322085 • 1990 Apr
Morning vs evening light treatment for winter depression. Evidence that the therapeutic effects of light are mediated by circadian phase shifts.
Arch Gen Psychiatry
Open PubMedPMID 35753149 • 2022 Aug
The effect of evening light on circadian-related outcomes: A systematic review.
Sleep Med Rev
Open PubMedPMID 34997782 • 2022 Mar
High sensitivity of melatonin suppression response to evening light in preschool-aged children.
J Pineal Res
Open PubMedPMID 39723449 • 2025 Jan
Light Environment of Arctic Solstices is Coupled With Melatonin Phase-Amplitude Changes and Decline of Metabolic Health.
J Pineal Res
Open PubMedPMID 30506899 • 2020 Jun
Strategies to decrease social jetlag: Reducing evening blue light advances sleep and melatonin.
Eur J Neurosci
Open PubMedPMID 25160887 • 2014 Nov
Out of synch with society: an update on delayed sleep phase disorder.
Curr Opin Pulm Med
Open PubMedPMID 24147658 • 2014 May
Effect of exposure to evening light on sleep initiation in the elderly: a longitudinal analysis for repeated measurements in home settings.
Chronobiol Int
Open PubMedPMID 24328728 • 2014 Apr
Independent associations of exposure to evening light and nocturnal urinary melatonin excretion with diabetes in the elderly.
Chronobiol Int
Open PubMedPMID 3836816 • 1985
Melatonin, light and chronobiological disorders.
Ciba Found Symp
Open PubMedPMID 23998286 • 2013 Nov
Antepartum depression severity is increased during seasonally longer nights: relationship to melatonin and cortisol timing and quantity.
Chronobiol Int
Open PubMedPMID 28548897 • 2017
Evening light exposure to computer screens disrupts human sleep, biological rhythms, and attention abilities.
Chronobiol Int
Open PubMedpost • r/sleep • unclear
Do video games make anyone else sleepy? I know a lot of articles and professionals say to avoid blue light at night time and I try to be really good about it, even turning off my bright lights at night and switching to softer color ambient…
Open mentionCommunity Sources
PUBMED • 2019 • Human evidence curation set
PMID 31690740 from Sci Rep.
Outcome: See linked PubMed abstract for methods and outcomes.[2159,2224,2237, etc.]
Open sourcePUBMED • 2025 • Human evidence curation set
PMID 39821044 from Geroscience.
Outcome: See linked PubMed abstract for methods and outcomes.[2159,2224,2237, etc.]
Open sourcePUBMED • 2017 • Human evidence curation set
PMID 28597081 from Eur J Appl Physiol.
Outcome: See linked PubMed abstract for methods and outcomes.[2159,2224,2237, etc.]
Open sourcePUBMED • 2016 • Human evidence curation set
PMID 27539026 from Sleep Med.
Outcome: See linked PubMed abstract for methods and outcomes.[2159,2224,2237, etc.]
Open sourcePUBMED • 1990 • Human evidence curation set
PMID 2322085 from Arch Gen Psychiatry.
Outcome: See linked PubMed abstract for methods and outcomes.[2159,2224,2237, etc.]
Open sourcePUBMED • 2022 • Human evidence curation set
PMID 35753149 from Sleep Med Rev.
Outcome: See linked PubMed abstract for methods and outcomes.[2159,2224,2237, etc.]
Open sourcePUBMED • 2022 • Human evidence curation set
PMID 34997782 from J Pineal Res.
Outcome: See linked PubMed abstract for methods and outcomes.[2159,2224,2237, etc.]
Open sourcePUBMED • 2025 • Human evidence curation set
PMID 39723449 from J Pineal Res.
Outcome: See linked PubMed abstract for methods and outcomes.[2159,2224,2237, etc.]
Open sourcePUBMED • 2020 • Human evidence curation set
PMID 30506899 from Eur J Neurosci.
Outcome: See linked PubMed abstract for methods and outcomes.[2159,2224,2237, etc.]
Open sourcePUBMED • 2014 • Human evidence curation set
PMID 25160887 from Curr Opin Pulm Med.
Outcome: See linked PubMed abstract for methods and outcomes.[2159,2224,2237, etc.]
Open sourcePUBMED • 2014 • Human evidence curation set
PMID 24147658 from Chronobiol Int.
Outcome: See linked PubMed abstract for methods and outcomes.[2159,2224,2237, etc.]
Open sourcePUBMED • 2014 • Human evidence curation set
PMID 24328728 from Chronobiol Int.
Outcome: See linked PubMed abstract for methods and outcomes.[2159,2224,2237, etc.]
Open sourcePUBMED • 1985 • Human evidence curation set
PMID 3836816 from Ciba Found Symp.
Outcome: See linked PubMed abstract for methods and outcomes.[2159,2224,2237, etc.]
Open sourcePUBMED • 2013 • Human evidence curation set
PMID 23998286 from Chronobiol Int.
Outcome: See linked PubMed abstract for methods and outcomes.[2159,2224,2237, etc.]
Open sourcePUBMED • 2017 • Human evidence curation set
PMID 28548897 from Chronobiol Int.
Outcome: See linked PubMed abstract for methods and outcomes.[2159,2224,2237, etc.]
Open source