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https://en.wikipedia.org/wiki/Caffeine#:~:text=The%20amount%20of%20caffeine%20needed%20to%20produce%20these,usually%20subside%20after%20about%20three%20or%20four%20hours.
https://www.cdc.gov/niosh/emres/longhourstraining/caffeine.html
Caffeine: Reducing Risks Associated with Long Work Hours Is a stimulant, and when used wisely, it can aid alertness Can reduce sleep, so it is important to understand its properties Takes about 30 minutes (range is 15 to 45 minutes) to take effect and has a half-life a of 5 to 6 hours, but it can... ...
https://www.brown.edu/campus-life/health/services/promotion/content/what-are-effects-caffeine
Caffeine's strongest effects are felt in the first hour after consuming it, but some effects can last from 4 to 6 hours. Caffeine causes neural excitation in the brain, which the pituitary gland perceives as an emergency and stimulates the adrenal glands to release adrenaline. Caffeine also increases dopamine levels -- the neurotransmitter that is affected by drugs like amphetamines …
https://my.clevelandclinic.org/health/articles/15496-caffeine-how-to-hack-it-and-how-to-quit-it
The effects of caffeine can be felt as soon as 15 minutes after it is consumed. The level of caffeine in your blood peaks about one hour later and stays at this level for several hours for most people. Six hours after caffeine is consumed, half of it is still in your body.
https://pubmed.ncbi.nlm.nih.gov/24235903/
Results: Results demonstrated a moderate dose of caffeine at bedtime, 3 hours prior to bedtime, or 6 hours prior to bedtime each have significant effects on sleep disturbance relative to placebo (p < 0.05 for all). Conclusion: The magnitude of reduction in total sleep time suggests that caffeine taken 6 hours before bedtime has important disruptive effects on sleep and provides …
https://www.healthline.com/health/how-long-does-caffeine-last
The effects from caffeine reach peak levels within 30 to 60 minutes of consumption. This is the time you’re most likely to experience the “jittery” effects of caffeine.
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3805807/
Disturbed sleep due to caffeine administered in divided doses within 3 hours of bedtime, including reduced total sleep time and stage 1-2 sleep, have previously been reported. 28 The finding that sleep was disrupted even 6 hours prior to bedtime adds to our current knowledge of caffeine effects on sleep and suggests that larger doses will have an important impact even during …
https://www.medicalnewstoday.com/articles/321784
Caffeine may have a greater effect on people who are sensitive to it. Caffeine has a half-life of about 5 hours. Someone who consumes 40 milligrams (mg) of caffeine will have 20 mg remaining in ...
https://www.healthline.com/health/caffeine-effects-on-body
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4424461/
Although plasma caffeine concentrations for both caffeine supplements were significantly greater than PL over the 8 hour study duration, CAF rapidly reached peak plasma caffeine concentration (2.40 ± 0.40 mg·L-1) at 3 hours following ingestion, while TR-CAF reached peak plasma caffeine concentration (1.88 ± 0.46 mg·L-1) at 6 hours following ...
https://www.quora.com/Why-do-I-feel-the-effects-of-coffee-14-hours-after-Ive-drank-it
However, caffeine can negatively affect sleep if drank too close to your bedtime as it prevents and delays the production of melatonin in your body. It would be best to either not drink coffee after 5pm or drink decaffeinated coffee drinks. Pros: A way to relax and unwind from a stressful day.
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