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“When you’re not getting sufficient sleep, 60% of all the weight you lose will come from lean muscle mass, not fat… When you are under-slept, your body becomes stingy at giving up its fat.” That’s because you’re not producing the hormones needed to maintain muscle, so your body loses it. If you’re trying to manage your weight, Dr Walker says sufficient sleep is vital. Putting it very bluntly, Dr Walker says, “The shorter your sleep, the shorter your life.” And we also know that men who are limited to just four or five hours of sleep a night for one week will have a level of testosterone someone 10 years his senior.” Lack of sleep can increase risk of diabetes, obesity and dementia. “After one week of short sleep your blood sugar levels are disrupted so significantly that your GP would classify you as pre-diabetic. Lack of sleep can quickly be severely damaging. Walker, “but you may have lost 50, 60, even 70% of all your REM sleep”, which means you’ve lost vital body-repair time. “You’ve lost 25% of all your sleep,” says Dr. If you cut an eight-hour sleep to six, you’re losing much of your vital REM sleep, because that mostly occurs towards the end of your sleep pattern. Just one week of poor sleep can do damageĬutting your sleep short can be more harmful than you might imagine. ” If you don’t get enough sleep, your body has less ability to repair muscles, so your workouts will be less effective. It’s also the time when we have the highest release of things like growth hormone, which is essential for body repair after. “We all need testosterone for our vitality.
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“REM sleep is actually the time when both males and females release the peak levels of testosterone,” says Dr Walker. If you sleep for eight hours, the final two hours may be mostly REM sleep (which is why you often wake up from dreams). Dr Walker explains that REM sleep usually occurs more toward the end of your night’s sleep.