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What is Sleep Fragmentation and how is it calculated?

Last Updated: Mar 02, 2018 10:10AM CST

What is Sleep Fragmentation?

Sleep Fragmentation is an index of restlessness during the sleep period expressed as a percentage. The higher the index, the more sleep is disrupted.

ActiLife calculates three values for sleep fragmentation: movement Index, a fragmentation index, and total sleep fragmentation Index.

  • The Movement Index (MI) is the percentage of epochs with y-axis counts greater than zero in the sleep period.
  • The Fragmentation Index (FI) is the percentage of one minute periods of sleep vs. all periods of sleep during the sleep period.
  • The Total Sleep Fragmentation Index (SFI) is the sum of the MI and the FI

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Sleep Fragmentation was added to ActiLife 6.12.

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