Why Do You Always Feel Sleepy and Sluggish at 3 PM? Here’s the Scientific Explanation!

Dr. Andrew Octovianus Wijaya

Have you ever felt your work motivation suddenly disappear the moment the clock strikes 3 PM? You’re not alone and it’s not simply because you didn’t get enough sleep or because you’re lazy. There’s actually an interesting scientific explanation behind this phenomenon.

Your Brain Has Its Own “Schedule”

A study published in the Journal of Neuroscience by researchers from Swinburne University of Technology found that the brain’s reward center operates according to a specific rhythm throughout the day. This reward center specifically a part of the brain called the Putamen - is most active in the morning and evening, and becomes weakest around 2 PM.

In other words, during those hours, your brain is actually at its least responsive state when it comes to motivation and enthusiasm.

What Is the Brain’s Reward Center?

In simple terms, the reward center is the part of the brain that becomes active whenever you experience something satisfying such as finishing a task, eating delicious food, or receiving praise from your boss. This is the system that keeps you motivated to continue working.

The study involved 16 participants who were asked to complete tasks at 10 AM, 3 PM, and 7 PM. The results were consistent: brain activity was always at its lowest during the afternoon. It’s as if the brain had already “predicted” that there would be no reward during those hours, causing motivation to drop as well.

This Is Not Weakness - It’s Biology

What’s important to understand is that this has nothing to do with being weak or lacking discipline. This is part of your circadian rhythm — the body’s 24-hour biological cycle that regulates nearly all bodily and mental functions, including your energy and motivation levels.

The good news is that there are practical steps you can take to deal with it.

Tips for Handling the Afternoon Slump:

• Schedule tasks that require deep focus in the morning
• Use the afternoon for routine tasks or light meetings
• Make sure your energy intake is well-managed before entering these critical hours

One of the most controllable factors is maintaining stable energy intake. A practical way to keep your energy steady during these critical hours is by eating smaller, balanced meals that prioritize protein, fiber, and low glycemic index (Low GI) carbohydrates before the slump hits.

YA’Bar is here to help you get through those moments. Made with carefully selected ingredients and Lontar Sugar with a low glycemic index (Low GI) that provides more stable and longer-lasting energy, YA’Bar is more than just a snack — it’s your reliable companion for staying active anytime and anywhere.

Source: Afternoon Slump Explained, Journal of Neuroscience, Food Coma