Coffee and Coffee Caffeine Influences Sleep Pattern and Quality in Doses Dependent Manner

Kyle J. Norton, Master of Nutrients
Health article writer and researcher; Over 10.000 articles and research papers have been written and published on line, including world wide health, ezine articles, article base, healthblogs, selfgrowth, best before it's news, the karate GB daily, etc.,.
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Coffee and coffee caffeine may have a strong effect in prolonged sleep latency, reduced total sleep time and sleep efficiency and and worsened perceived sleep quality, a joint study lead by the University of Zürich postulated.
Coffee, becoming a popular and social beverage all over the world, particular in the West, is a drink made from roast bean from the Coffea plant, native to tropical Africa and Madagascar.

In a review systematically explores evidence from epidemiological studies and randomized controlled trials. researchers filed the below interesting results
1. Caffeine affected the sleep quality more in of older adults in compared to younger adults.
2. Pronounced individual differences are also present in young people,
3. Genetic complex may also play an important role in individual sensitivity to sleep disruption by caffeine.

Furthermore, researchers also expressed the concerns of studies in the review with mostly conducted in male adults of Western countries, which may limit the generalizability of the findings

Other, in the study of active duty military personnel (N = 366) returned from deployments to Afghanistan or Iraq in seeking treatment for PTSD, researchers found that
1. Higher caffeine use in these group veterans showed a lower insomnia symptom severity in compared to elevated insomnia symptom severity in no caffeine use group.
2. Caffeine use was not associated with any other measures of sleep disturbance or with PTSD symptoms.

The study also explained that caffeine do not induced greater effect in insomnia and sleep disturbances in this sample probably due to the result of insomnia symptoms was already elevated in this sample, instead of insomnia symptoms severity abstained from any caffeine intake.

Interestingly, in a 13-night sleep laboratory study of 18 normal young adult males twice received 1 cup of warm water, 1-, 2-, and 4-cup equivalents of regular coffee, a 4-cup equivalent of decaffeinated coffee, and a 4-cup equivalent of caffeine administered 30 min before bedtime according to a balanced Latin-square design,

1. Coffee intake showed a dose-related changes in most standard electroencephalogram-electrooculogram (EEG-EOG) in sleep parameters.
2. Regular coffee and caffeine intake caused rapid eye movement (REM) sleep to shift to the early part of the night and stages 3 and 4 sleep to shift to the later part.
3. Decaffeinated coffee had no effect

Taking altogether, there is no doubt that coffee may have a found effect in affecting sleep pattern and sleep quality in dose dependent manor. People with history of insomnia and sleep disturbance should reduce intake of coffee and only drink them in the morning.

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Sources
(1) Coffee, caffeine, and sleep: A systematic review of epidemiological studies and randomized controlled trials by Clark I1, Landolt HP2.(PubMed)
(2) Caffeine Use in Military Personnel With PTSD: Prevalence and Impact on Sleep by McLean CP1, Zandberg L1, Roache JD2, Fitzgerald H1, Pruiksma KE2, Taylor DJ3, Dondanville KA2, Litz BT4,5,6, Mintz J2,7, Young-McCaughan S2, Yarvis JS8, Peterson AL2,9,10, Foa EB1; STRONG STAR Consortium(PubMed)