![]() ![]() Overview of sleep: The neurologic processes of the sleep-wake cycle. Bedtime and sleep duration in relation to depressive symptoms among Japanese workers. Duration and timing of sleep are associated with repetitive negative thinking. The importance of sleep and understanding sleep stages. Sleeping hours: What is the ideal number and how does age impact this? Your mind is most aware, fresh, and concentration levels are at their best. You can learn more about how we ensure our content is accurate and current by reading our editorial policy. We link primary sources - including studies, scientific references, and statistics - within each article and also list them in the resources section at the bottom of our articles. Medical News Today has strict sourcing guidelines and draws only from peer-reviewed studies, academic research institutions, and medical journals and associations. Paying attention to how they feel in the morning and noting how many hours of sleep they got may help a person identify their sleep cycle and determine how much sleep they need. Waking up at the end of the cycle, when sleep is lightest, may be best to help the person wake feeling more rested and ready to start the day.Īn alarm going off when a person is in one of the deeper stages of sleep may lead to grogginess or difficulty waking up.Īgain, these stages vary from person to person, meaning that no single timing for sleep is right for everyone. Ideally, the body will pass through four to five of these cycles each night. The latest research indicates that theres no difference between waking up early in the morning, or sleeping until the late afternoon. Over more cycles, the NREM stages get lighter, and the REM stages get longer. The body cycles through these stages roughly every 90 minutes. The body moves between these states a few times a night. It is a combination of external conditions, such as light, personal behaviors, and lifestyle choices, and internal conditions, such as brain wave patterns and genetics.Ī normal sleep cycle occurs in two distinct states: rapid eye movement (REM) sleep and nonrapid eye movement (NREM) sleep. On average, it takes about 14 minutes to fall asleep. Keep in mind: the calculator does not consider how long a person needs to fall asleep. It suggests sleeping time based on the stages of sleep and helps avoid waking up in the middle of the sleep cycle. The sleep cycle is a natural internal system in humans. The Sleep Calculator recommends when to go to sleep in order to wake up feeling refreshed.
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