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Time for Coffee? Ask Your Smart Phone

Time for Coffee? Ask Your Smart PhoneTrendy new software for our smart phones is sure to perk us up as the Caffeine Zone app helps people determine when they need a shot of java.

Caffeine intake is generally beneficial although an inappropriate dose can cause nervousness and sleep problems.

The new software application can help people determine when caffeine may give them a mental boost and when it could hurt their sleep patterns.

The software takes information on caffeine use and integrates it with information on the effects of caffeine to produce a graph of how the caffeine will affect the users over time.

“Many people don’t understand how caffeine levels in their bloodstream go up and how they go down,” said Frank Ritter, Ph.D., a Penn State University professor. “It’s important to understand the effect that caffeine can have at these various levels.”

Ritter said that if a person drinks a cup of coffee rapidly, they will experience a spike in mental alertness, but enough of the drug can linger in the bloodstream to cause sleep problems hours later.

In the study, researchers looked at prior studies to determine that the level of caffeine in the bloodstream for optimal alertness is between 200 and 400 milligrams of caffeine. For sleep, the researchers set a lower threshold of 100 milligrams.

Drinkers may have sleep problems if they remain above this.

The investigators said people who drink too much caffeine, too quickly, may face other problems. A spike of caffeine above the optimal level can cause nausea and nervousness.

Experts say that maintaining a proper caffeine balance is important for many workers. For example, sailors on submarines must carefully watch their sleep patterns because their sleeping and waking patterns vary each day, Ritter said.

“If they, and others who drink coffee to stay awake, drink too much coffee on one shift, they may have trouble sleeping,” said Ritter. “So, the next day, they’ll drink even more coffee and have even more trouble sleeping.”

The software application helps to forecast caffeine’s action by performing calculations based on what an individual enters on how much caffeine they drank, or plan to drink, and when they plan to have a caffeinated beverage. They also can add how fast they drink the beverage.

The app can also help people determine when to modify their caffeine habits, so that they might choose to drink a decaffeinated beverage, or mix a blend of caffeinated and decaffeinated coffees.

The app is available on iTunes for free with advertisements and for purchase without ads. It only works on Apple devices — the iPhone, iPod Touch and iPad.

Source: Penn State University

Young woman drinking coffee and using phone photo by shutterstock.

Time for Coffee? Ask Your Smart Phone

Rick Nauert PhD

Rick Nauert, PhDDr. Rick Nauert has over 25 years experience in clinical, administrative and academic healthcare. He is currently an associate professor for Rocky Mountain University of Health Professionals doctoral program in health promotion and wellness. Dr. Nauert began his career as a clinical physical therapist and served as a regional manager for a publicly traded multidisciplinary rehabilitation agency for 12 years. He has masters degrees in health-fitness management and healthcare administration and a doctoral degree from The University of Texas at Austin focused on health care informatics, health administration, health education and health policy. His research efforts included the area of telehealth with a specialty in disease management.

APA Reference
Nauert PhD, R. (2018). Time for Coffee? Ask Your Smart Phone. Psych Central. Retrieved on September 30, 2020, from
Scientifically Reviewed
Last updated: 8 Aug 2018 (Originally: 16 Feb 2012)
Last reviewed: By a member of our scientific advisory board on 8 Aug 2018
Published on Psych All rights reserved.