![]() ![]() This phase is also known as “slow wave sleep.” It’s when your heart rate, breathing, and brainwaves are slowest. You spend about 50 percent of your sleep cycle in this phase. ![]() Your body’s systems relax further, your core temperature drops, and your brain waves are slower. ![]() This stage lasts a few minutes as you drift from being awake to being asleep. Non-REM (non-rapid eye movement) sleep has 3 stages. Your body goes through various stages of sleep each night. Some of those smaller bursts of cortisol correspond to shifts in your sleep cycles. In addition to the circadian cycle, around 15 to 18 smaller pulses of cortisol are released throughout the day and night. For many people, the peak is around 9 a.m. It peaks about an hour after you wake up. ![]() The production of cortisol in your body follows a similar circadian rhythm.Ĭortisol production drops to its lowest point around midnight. Every 24 hours, roughly synchronized with nighttime and daytime, your body enters a period of sleep followed by a waking period. Your sleep-wake cycle follows a circadian rhythm. When something disrupts the HPA axis functions, it can disrupt your sleep cycles as well. Sleep and the stress response share the same pathway: the HPA axis. So what does cortisol have to do with sleep? ![]()
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