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A person feels sleepy after eating carbohydrates because carbs make tryptophan and serotonin more accessible to the brain, according to WebMD. Simple carbohydrates can also make a person feel sleepy, explains Brian Willett on the Jillian Michaels website.


To get sleepy, a person should be comfortable and relaxed, and at least a little bit physically tired. Numerous relaxation techniques can assist in causing a person to get sleepy.


Heat makes people sleepy because of the mechanisms the body uses to keep itself cool, lack of adjustment to warm temperatures and lack of sleep due to exposure to hot, humid nights, according to Global Bioweather. The human body takes several days to acclimate to the he...


Drowsiness may occur as a side effect of taking ibuprofen, according to WebMD. While this symptom is not noted as serious, it is recommended a person contact a doctor if problems persist. Other possible side effects include nausea, vomiting, constipation, diarrhea and h...


Caffeine is a stimulant that blocks certain chemicals in the brain, preventing signals of sleepiness and languor from being transmitted. Caffeine can also improve reaction times, memory and reasoning skills. However, in high doses, caffeine can make people anxious or ir...


The ingredient in Benadryl that causes drowsiness is diphenhydramine. Commonly used as an antihistamine to treat allergies, diphenhydramine is also used as a sleep aid. Diphenhydramine is also classified as a CNS depressant, sedative and antiemetic.


A moderate amount of caffeine may help a person feel more alert and awake, but excessive consumption does present health risks. For adults in good health, up to 400 milligrams of caffeine per day is generally acceptable, according to Mayo Clinic.