J Clin Endocrinol Metab March 2011 PMID 21193540

Exposure to room light before bedtime suppresses melatonin onset and shortens melatonin duration in humans.

Joshua J Gooley, Kyle Chamberlain, Kurt A Smith, Sat Bir S Khalsa, Shantha M W Rajaratnam, Eliza Van Reen, Jamie M Zeitzer, Charles A Czeisler, Steven W Lockley

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275
Peak: 10 in Jun 2022
across 5 sources since Jun 2019

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AI synopsis

What people are saying

Several comments explicitly reference the study's core result, like the mention of melatonin suppression due to room light exposure, while others connect it to mitochondrial health, which deepens the discussion. The tone varies from scientific acknowledgment to practical concerns about sleep environments, with word choices like 'suppresses' and 'shortens' underscoring the potential impact on health and sleep quality.

AgreementStrong agreement

Most discussions reinforce the article's findings, emphasizing that pre-bedtime light exposure suppresses melatonin, indicating a consensus on the research's validity.

InterestHigh interest

Posts show high curiosity, with many referencing implications for health and sleep, and some mentioning melatonin's role in mitochondrial protection, which indicates strong relevance.

EngagementHigh engagement

Several comments delve into specific mechanisms, such as how dim versus bright lights affect melatonin, or connect this research to broader health topics like mitochondrial health, demonstrating deep engagement.

ImpactHigh impact

The discussions suggest the article's findings could significantly influence how people think about bedtime routines and lighting habits, with some posts calling for behavioral changes or highlighting its importance for sleep health.

Abstract in brief

  • Exposure to room light before bedtime significantly suppresses melatonin production, delays its onset, and shortens its duration in humans.
  • The study compared individuals exposed to bright room light (200 lux) with those in dim light (3 lux), finding that light exposure caused a reduction of about 90 minutes in melatonin duration and suppressed its overall levels during sleep.
  • These effects suggest that late-evening electrical lighting can disrupt natural melatonin signaling, potentially impacting sleep, body temperature regulation, blood pressure, and blood sugar control.]

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Mg2+ Papi, the BowTied Mg2+
@Grimhood · X

Exposure to room light before bedtime suppresses melatonin onset and shortens melatonin duration in humans https://t.co/uPYopUOlqN https://t.co/c7W1LR0FYM

Mar 3, 2022 · 42 likes · 3 shares · 134,150 followers View post →
⚡️ The Blue Light Diet ⚡️
@BlueLightDiet · X

Do all you #mitochondria lovers realize #melatonin repairs/protects mitochondria? Relatively dim light at night & even bright red light can suppress your melatonin output making it suck to be ur mitochondria Dark nights, bright days = happy mitochondria https://t.co/vCvjwEOjun

Jun 6, 2022 · 37 likes · 12 shares · 32,182 followers View post →
Mikki Williden PhD
@MikkiWilliden · X

Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans https://t.co/88Qxly1mbT

Jul 10, 2021 · 16 likes · 3 shares · 2,241 followers View post →
Peter Miles
@PeterMilesMD · X

In conclusion, our findings demonstrate that melatonin levels are remarkably sensitive to room light levels, with exposure before bedtime resulting in strong suppression of melatonin synthesis. https://t.co/cAFe4mBR0y

Jun 8, 2019 · 11 likes · 2 shares · 363 followers View post →
Rusty ⚡️: Solar Powered ☀️
@ze_rusty · X

https://t.co/WuYt8iHjlg

Apr 17, 2025 · 8 likes · 2 shares · 22,370 followers View post →
Magnesium Girl - yin solutions for a yang world
@LocalRachel · X

For example: Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans https://t.co/ogjmedUCuM

Jan 29, 2023 · 5 likes · 1 share · 8,894 followers View post →

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'K',©
@litinspace · X

RT @ze_rusty: https://t.co/WuYt8iHjlg

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SursumCorda
@SursumCorda5555 · X

RT @ze_rusty: https://t.co/WuYt8iHjlg

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Rusty ⚡️: Solar Powered ☀️
@ze_rusty · X

https://t.co/WuYt8iHjlg

Apr 17, 2025 · 8 likes · 2 shares · 22,370 followers View post →
Zeptej se vědce
@Zeptej_se_vedce · X

Dec 21, 2024 · 4 likes · 16,642 followers View post →
Dr Jon K
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@hubermanlab https://t.co/rDQeQLu7wC

Dec 10, 2024 · 3,225 followers View post →
Jack
@jack_schroder_ · X

Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans https://t.co/AqB3c6efxh

Sep 9, 2024 · 14,451 followers View post →
Tashibite
@Tashibite1 · X

RT @BlueLightDiet: Do all you #mitochondria lovers realize #melatonin repairs/protects mitochondria? Relatively dim light at night & even…

Jul 9, 2023 · 12 shares · 1,587 followers View post →
エミリー
@emily_luvcat · X

RT @nentorefumimama: ”就寝前の室内光照射は、薄暗い光と比較してメラトニンを抑制し、99.0%の人でメラトニンの発現が遅くなり、メラトニン持続時間が約90分短縮。通常の睡眠時間帯に室内光を照射すると、ほとんどの試験(85%)でメラトニンが50%以上抑制された…

Jun 13, 2023 · 1 share · 21,312 followers View post →
赤ちゃんのねんね相談®︎|夜泣き相談|原田智恵
@nentorefumimama · X

”就寝前の室内光照射は、薄暗い光と比較してメラトニンを抑制し、99.0%の人でメラトニンの発現が遅くなり、メラトニン持続時間が約90分短縮。通常の睡眠時間帯に室内光を照射すると、ほとんどの試験(85%)でメラトニンが50%以上抑制された”(下記文献より)https://t.co/Ud9Kc5FpUC

Jun 13, 2023 · 2 likes · 1 share · 13,700 followers View post →
赤ちゃんのねんね相談®︎|夜泣き相談|原田智恵
@nentorefumimama · X

”就寝前の室内光照射は、薄暗い光と比較してメラトニンを抑制し、99.0%の人でメラトニンの発現が遅くなり、メラトニン持続時間が約90分短縮。通常の睡眠時間帯に室内光を照射すると、ほとんどの試験(85%)でメラトニンが50%以上抑制された”(下記文献より)https://t.co/Ud9Kc5FpUC

Apr 24, 2023 · 1 like · 13,700 followers View post →
あ
@CoTfse · X

RT @LocalRachel: For example: Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans h…

Jan 29, 2023 · 1 share · 778 followers View post →
Magnesium Girl - yin solutions for a yang world
@LocalRachel · X

For example: Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans https://t.co/ogjmedUCuM

Jan 29, 2023 · 5 likes · 1 share · 8,894 followers View post →
Kwaku -
@KwakuAkyeampon2 · X

RT @BlueLightDiet: Do all you #mitochondria lovers realize #melatonin repairs/protects mitochondria? Relatively dim light at night & even…

Aug 28, 2022 · 12 shares · 13 followers View post →
Chipman
@Chipin8or · X

RT @bluelightdiet: Do all you #mitochondria lovers realize #melatonin repairs/protects mitochondria? Relatively dim light at night & even…

Jun 8, 2022 · 12 shares · 256 followers View post →
⚡️ The Blue Light Diet ⚡️
@BlueLightDiet · X

RT @bluelightdiet: Do all you #mitochondria lovers realize #melatonin repairs/protects mitochondria? Relatively dim light at night & even…

Jun 8, 2022 · 12 shares · 32,182 followers View post →
James Tang
@James69888 · X

RT @bluelightdiet: Do all you #mitochondria lovers realize #melatonin repairs/protects mitochondria? Relatively dim light at night & even…

Jun 7, 2022 · 12 shares · 1,601 followers View post →
Dr Shelley James
@DrShelleyJames · X

RT @bluelightdiet: Do all you #mitochondria lovers realize #melatonin repairs/protects mitochondria? Relatively dim light at night & even…

Jun 6, 2022 · 12 shares · 419 followers View post →
Age of Light Innovations
@ageoflight_ · X

RT @bluelightdiet: Do all you #mitochondria lovers realize #melatonin repairs/protects mitochondria? Relatively dim light at night & even…

Jun 6, 2022 · 12 shares · 50 followers View post →
Football Entangled
@FEntangled · X

RT @bluelightdiet: Do all you #mitochondria lovers realize #melatonin repairs/protects mitochondria? Relatively dim light at night & even…

Jun 6, 2022 · 12 shares · 355 followers View post →
Tin Hat Man.
@jonoskews · X

RT @bluelightdiet: Do all you #mitochondria lovers realize #melatonin repairs/protects mitochondria? Relatively dim light at night & even…

Jun 6, 2022 · 12 shares · 1,283 followers View post →
Alejandro Zoccola
@zoccosunlight · X

RT @bluelightdiet: Do all you #mitochondria lovers realize #melatonin repairs/protects mitochondria? Relatively dim light at night & even…

Jun 6, 2022 · 12 shares · 221 followers View post →
JF
@yjfang22 · X

RT @bluelightdiet: Do all you #mitochondria lovers realize #melatonin repairs/protects mitochondria? Relatively dim light at night & even…

Jun 6, 2022 · 12 shares · 790 followers View post →
⚡️ The Blue Light Diet ⚡️
@BlueLightDiet · X

Do all you #mitochondria lovers realize #melatonin repairs/protects mitochondria? Relatively dim light at night & even bright red light can suppress your melatonin output making it suck to be ur mitochondria Dark nights, bright days = happy mitochondria https://t.co/vCvjwEOjun

Jun 6, 2022 · 37 likes · 12 shares · 32,182 followers View post →
arkahc
@arkahc12 · X

RT @Grimhood: Exposure to room light before bedtime suppresses melatonin onset and shortens melatonin duration in humans https://t.co/uPYop…

Mar 4, 2022 · 3 shares · 121 followers View post →
ENDALA klinika zdraví
@endalaclinic · X

Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans https://t.co/1hldT739SA

Mar 4, 2022 · 1 like · 254 followers View post →
Mg2+ Papi, the BowTied Mg2+
@Grimhood · X

Exposure to room light before bedtime suppresses melatonin onset and shortens melatonin duration in humans https://t.co/uPYopUOlqN https://t.co/c7W1LR0FYM

Mar 3, 2022 · 42 likes · 3 shares · 134,150 followers View post →
Ignacio Hernando Valle
@nachoafysalud · X

RT @MikkiWilliden: Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans https://t.co/…

Jul 11, 2021 · 3 shares · 5,835 followers View post →
Wiley Long
@WileyLong · X

RT @MikkiWilliden: Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans https://t.co/…

Jul 10, 2021 · 3 shares · 1,466 followers View post →
Jeffery Nutrition
@JefferyNutr · X

Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans https://t.co/1g0BgbCFSf

Jul 10, 2021 · 287 followers View post →
Julianne Taylor, Nutritionist
@juliannejtaylor · X

RT @MikkiWilliden: Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans https://t.co/…

Jul 10, 2021 · 3 shares · 5,316 followers View post →
Mikki Williden PhD
@MikkiWilliden · X

Exposure to Room Light before Bedtime Suppresses Melatonin Onset and Shortens Melatonin Duration in Humans https://t.co/88Qxly1mbT

Jul 10, 2021 · 16 likes · 3 shares · 2,241 followers View post →
Hannah Robinson
@Hannahjr72 · X

RT @HariSel45215838: In conclusion, our findings demonstrate that melatonin levels are remarkably sensitive to room light levels, with expo…

Jun 8, 2019 · 2 shares · 135 followers View post →
Natural Law Enforcer
@BChinatti · X

RT @HariSel45215838: In conclusion, our findings demonstrate that melatonin levels are remarkably sensitive to room light levels, with expo…

Jun 8, 2019 · 2 shares · 1,211 followers View post →
Peter Miles
@PeterMilesMD · X

In conclusion, our findings demonstrate that melatonin levels are remarkably sensitive to room light levels, with exposure before bedtime resulting in strong suppression of melatonin synthesis. https://t.co/cAFe4mBR0y

Jun 8, 2019 · 11 likes · 2 shares · 363 followers View post →