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Verywell Health on MSN8d
The 4 Stages of Sleep: What Happens During Each CycleREM stages and one REM stage. Ideally, you repeatedly cycle through each stage. Learn how long each stage lasts.
The following diagram illustrates the menstrual cycle. It also shows the changing levels of the two hormones involved in the process. The menstrual cycle usually lasts approximately 28 days.
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