Do you burn calories sleeping? Naturally! And no, sleeping is not the most effective way to lose weight, but too little sleep does make you fatter than a good night’s sleep. A lot happens in your body while you sleep. You rest, but that also costs quite a bit of energy. How many calories do you burn in your sleep? That depends on how long you sleep, but also on the temperature of your bedroom and your weight, for example.
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Getting slim while sleeping, sounds unrealistic? Well, because your body is working hard, you burn calories sleeping. And that can just be two croquettes or a bowl of chips. But how many calories do you burn sleeping? Simple, your body needs 1 kcal per hour per kilogram of body weight to sleep. So if you weigh 60 kilograms and sleep for 8 hours, that’s 480 kcal. If you weigh 80 kilograms and only sleep for 6 hours, you will also burn 480 kcal. If you do sleep the holy 8 hours, your body needs 160 kcal extra for that, namely 640. That is why losing weight in the beginning is also faster than your target weight. Your body is less heavy and simply needs less energy for all those activities.
Don’t feel like calculating yourself? In the table below you can easily see how much you burn during your sleep. For intermediate sleep times and weights, just pick whichever number is closest to an estimate.
Weight | 6 hours | 7 hours | 8 hours | 9 hours | 10 hours |
50 kilo | 300 | 350 | 400 | 450 | 500 |
60 kilo | 360 | 420 | 480 | 540 | 600 |
70 kilo | 420 | 490 | 560 | 630 | 700 |
80 kilo | 480 | 560 | 640 | 720 | 800 |
90 kilo | 540 | 630 | 720 | 810 | 900 |
100 kilo | 600 | 700 | 800 | 900 | 100 |
110 kilo | 660 | 770 | 880 | 990 | 1100 |
As you can see, you can burn a lot of calories during your sleep. However, if you walk for an hour with a weight of 70 kilograms, you burn about 270 kcal, quite a bit more than the 70 that you don’t have to do anything for in your sleep.
Still, you can slightly influence the amount of calories you burn in your sleep. Your body needs some of the energy to stay warm. When it’s colder in your bedroom, your body has to work harder to maintain the temperature, so it burns a little more calories. 16 degrees is warm enough for the bedroom. You can achieve this by leaving the window ajar at night, if it is safe to do so. And of course the heating does not have to be on, which also makes a nice difference in energy costs. Replacing your thick duvet with a thin blanket and leaving your pajamas in the closet also help, of course.
Before you think that an hour less sleep in exchange for a brisk walk makes you slimmer, it doesn’t have to be. Too little sleep makes you fatter. During your sleep, among other things, your body produces the hormones ghrelin and leptin. The more ghrelin, the greater your feeling of hunger, and the more leptin, the greater your feeling of satiety. With a bad night’s sleep, these hormones get out of balance and you will want to eat more. It is therefore very important to enjoy the right amount of sleep on a good bed with a good mattress.
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During your sleep you burn 1 kcal per kilogram of body weight per hour. If you weigh 80 kilos, you burn 640 kcal with 8 hours of sleep. That is equal to almost two croquette sandwiches!
By sleeping in a cooler environment, you burn more calories. This can be done by turning off the heating and opening a window if necessary. Less thick bedding and sleeping naked, for example, also result in a higher combustion.