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https://www.webmd.com/diet/caffeine-myths-and-facts#:~:text=Consuming%20caffeine%20later%20in%20the%20day%2C%20however%2C%20can,and%20the%20amount%20of%20caffeine%20you%20regularly%20get.
https://www.brown.edu/campus-life/health/services/promotion/content/what-are-effects-caffeine
What are the effects of 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.
https://uhs.princeton.edu/health-resources/caffeine
increased alertness. increased blood pressure. increased breathing rate. increased urination. These effects are mostly due to caffeine increasing your metabolic rate (though it has not been linked to weight loss). Caffeine is also a diuretic, which causes increased urination, and may lead to dehydration.
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://www.healthline.com/health/how-long-does-caffeine-last
These symptoms may include: headache (the most common symptom) depression anxiety drowsiness and fatigue
https://www.healthline.com/health/caffeine-effects-on-body
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3805807/
The caffeine condition reduced sleep efficiency by 5%, prolonged sleep latency by 12-16 min, and reduced total sleep time by 25-30 min relative to placebo.28However, as this study investigated the combined effects of the 2 doses, the comparative effects of time of administration could not be determined.
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 empirical support for sleep …
https://blog.sofitapp.com/2021/11/30/caffeine-how-does-it-affect-your-body/
Caffeine boosts your energy and mood and makes you more alert. That can sometimes be helpful, especially in the morning or when you're trying to work. Though your body doesn't store it, caffeine can affect you for up to 6 hours after you swallow …
https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/in-depth/caffeine/art-20045678
If you're susceptible to the effects of caffeine, even small amounts may prompt unwanted effects, such as restlessness and sleep problems. How you react to caffeine may be determined in part by how much caffeine you're used to drinking. People who don't regularly drink caffeine tend to be more sensitive to its effects.
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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