The time of day you drink coffee can affect your energy levels, alertness, and sleep quality, according to nutritionists Experts say consuming caffeine right after waking up can increase nervousness and ultimately contribute to a drop in energy levels. In the early hours of the day, the body produces more cortisol, a hormone related to alertness, and drinking coffee during this time can increase feelings of anxiety In the morning, the most appropriate time to consume coffee is between the hours of 9AM and 11AM, when cortisol levels begin to decline More important than the time of day is the amount consumed. Experts recommend avoiding excessive caffeine and not exceeding about four cups of coffee per day. It's also important to avoid coffee close to bedtime, as caffeine can remain active in the body for several hours and interfere with sleep. To reduce your caffeine consumption in the afternoon or evening, try swapping out your cup of coffee for a lower-caffeine option like green or black tea.