Stage three is known as deep sleep, where the body further relaxes and restores itself to help with growth and recovery. In this stage, itвЂ™s harder to be woken up by external stimuli and it lasts about 10вЂ“16 minutes. At the same time, your brain activity changes and eye movements stop. Once youвЂ™ve entered stage two, your muscles relax, your body temperature drops, and your breathing and heart rate slow. The body soon follows, with occasional movements like twitches. During this time, the sleeper hasnвЂ™t fully relaxed their body, but the brain starts to slow down and lightly changes in activity associated with falling asleep. Stage one is often referred to as the transition stage and lasts only one to five minutes. Each stage is determined by the brain activity while you sleep, which shows distinct patterns that identify a specific stage. One for rapid eye movement (REM) and the other three that form non-REM (NREM) sleep. Later cycles will range from 90 to 120 minutes, but the composition of each cycle will change as the night goes on. The first sleep cycle you go through is usually the shortest, ranging from 70 to 100 minutes. ItвЂ™s typical for your sleep cycles to change as you progress through a nightвЂ™s worth of sleep. However, not all sleep cycles are the same length and vary depending on different factors such as age, sleep patterns, and personal preferences. On a typical night, the average person goes through four to six sleep cycles that last around 90 minutes each.

There are four total stages in a sleep cycle, each lasting a different amount of time. Sleep cycles are the stages your body goes through each night as you snooze. Although sleep duration is important, itвЂ™s also critical to focus on your sleep cycle. Contrary to popular belief, the amount of time you spend sleeping doesnвЂ™t guarantee a good nightвЂ™s rest.

When should i sleep