Cycle education

Perimenopause and changing periods

Perimenopause is the transition leading up to menopause. During this time, menstrual cycles can become less predictable, and some people notice changes in their periods, sleep, mood, energy, or other symptoms.

By RedBird · Published September 21, 2026 · Updated September 21, 2026

How periods can change

During perimenopause, periods may become:

  • closer together or farther apart
  • longer or shorter
  • heavier or lighter
  • less predictable from month to month

These changes can happen gradually and may look different for everyone.

Other changes you may notice

Some people also notice changes in:

  • sleep
  • temperature regulation
  • night sweats
  • mood
  • energy
  • headaches
  • concentration or brain fog
  • other physical symptoms

Why tracking can still be useful

Tracking doesn’t have to be about predicting your next period perfectly.

RedBird can help you build a personal history of:

  • period dates
  • cycle length
  • bleeding patterns
  • symptoms
  • sleep changes
  • mood
  • energy
  • temperature-related experiences

That record can make it easier to look back and see how your experience is changing over time.

References

Related RedBird guides

Track period symptoms · Explore personalized tracking

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