Why Does A Hot Tub Make You Tired?

Those who suffer from sleep problems are often looking for new ways to help them bed down. Some may try a variety of medications while others look to exercise or traditional home remedies. Those who own a hot tub already understand that soaking in the warm, massaging waters can help you fall asleep. But why does a hot tub make you tired? In this article, we’ll cover several different reasons why soaking in a hot tub can make you sleepy.


Thermoregulation is the term that is used to describe the body’s ability to maintain a consistent temperature. It should ideally be within the range of 36.1C to 37.2C (97F to 99F.) If you’re generally in good health your body’s thermoregulation processes can easily maintain this temperature range. That said, the body’s temperature changes throughout the day. It begins warming up when you awaken and gradually increases until the evening when it begins to cool off again. This sends signals to the brain that make you tired and indicate that it’s time to go to sleep. If you have problems falling asleep you can use your hot tub to mimic this thermoregulatory cycle. Getting into the hot tub will increase your internal body temperature while getting out will allow it to fall again. This can trick your brain into feeling tired and trigger the onset of sleep.

Increased Blood Flow

As your body temperature rises when soaking in a hot tub, your blood circulation is stimulated. The heart begins beating faster, the blood vessels dilate to allow blood to flow more easily while oxygen and other blood-bound nutrients are circulated throughout the body. This increase in blood flow speeds up the removal of toxins and stimulates internal repair processes. Ultimately this results in the reduction of pain and the creation of more restful and relaxed circumstances. Conversely, when the blood flow is restricted as a result of stress or reduced temperatures, blood pressure is increased, and the flow of nutrients is diminished. This has been found to be associated not only with health problems, but difficulty with falling asleep and staying asleep throughout the night.


One of the most anticipated results of using a hot tub is the feeling of relaxation that it engenders. There are many processes that contribute to this feeling of relaxation. These include, but aren’t limited to, the production of pleasure-causing hormones, increased blood flow washing away toxins and water buoyancy reducing the load on weight-bearing joints, bones and muscles. Soaking in warm, massaging water can also relax the mind and help produce a state of mental wellbeing. This combination of physical and psychological relaxation can lead to calmness and sleepiness.


Although many of the reasons mentioned above describing how one might feel tired after spending time in a hot tub might be considered positive changes, there can also be negative reasons for feeling drowsy after a soak. Dehydration is one of these. As your body temperature rises, your internal thermoregulation processes will try to cool you off by producing sweat. Without replenishment of these lost liquids, your body can become prone to dehydration. One of the symptoms of dehydration is a feeling of tiredness. And while you may be using your hot tub to help make you feel tired, you should be cautious if the reason for this tiredness is a result of severe dehydration.

Now that you’ve learned some of the reasons why you might feel tired after spending time in a hot tub, download a free buyer’s guide for more information.

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