--- title: Sleep Stage during a Sleep Activity description: The Hexoskin-validated sleep algorithm is based on documented physiological characteristics observed in the different sleep states. The Hexoskin decision tree algorithm automatically classifies sleep --- [Skip to content](https://support.hexoskin.com/sleep-stage-during-a-sleep-activity#main-content) - [English](https://support.hexoskin.com/sleep-stage-during-a-sleep-activity) - [Français](https://support.hexoskin.com/fr/stade-de-sommeil-dans-une-activité-de-sommeil) English Show submenu for translations [More support](https://support.hexoskin.com/kb-tickets/new?hsLang=en) [![Hubspot - Hexoskin Logo - Rectangle](https://support.hexoskin.com/hubfs/Hubspot%20-%20Hexoskin%20Logo%20-%20Rectangle.svg)](https://support.hexoskin.com/?hsLang=en) Open main navigation Close main navigation - - [English](https://support.hexoskin.com/sleep-stage-during-a-sleep-activity) - [Français](https://support.hexoskin.com/fr/stade-de-sommeil-dans-une-activité-de-sommeil) English Show submenu for translations - [More support](https://support.hexoskin.com/kb-tickets/new) - [Contact us](https://support.hexoskin.com/kb-tickets/new) [Contact us](https://support.hexoskin.com/kb-tickets/new?hsLang=en) How can we help you? - There are no suggestions because the search field is empty. 1. [Hexoskin Support Community](https://support.hexoskin.com/?hsLang=en) 2. [Hexoskin Data Analysis](https://support.hexoskin.com/hexoskin-data-analysis?hsLang=en) # Sleep Stage during a Sleep Activity The Hexoskin-validated sleep algorithm is based on documented physiological characteristics observed in the different sleep states. ![](https://support.hexoskin.com/hubfs/mceclip0-png-Oct-23-2023-06-32-40-4148-PM.png) The Hexoskin decision tree algorithm automatically classifies sleep into three vigilance states: Wake, NREM sleep, and REM sleep. All three sleep stages will be shown on your Hexoskin App after data synchronization. ![](https://support.hexoskin.com/hs-fs/hubfs/mceclip2-png-Oct-23-2023-06-33-11-3554-PM.png?width=294&height=522&name=mceclip2-png-Oct-23-2023-06-33-11-3554-PM.png) On the Hexoskin Dashboard, you may also view all the sleep-related metrics. By selecting a sleep activity of your choice, you will find the sleep phases in the “Charts” section, under the “Processed Data” tab, and by selecting the “Sleep phases” tab. A histogram of the sleep phases as well as of all the other metrics can be revealed by clicking on “Show histograms”. ![](https://support.hexoskin.com/hubfs/mceclip0%20(1)-png-2.png) If you import your data in binary format, you will find the transitions between the sleep stages in the file named “sleep\_phase.csv”. To decipher the sleep phases, please refer to this [documentation](https://api.hexoskin.com/docs/resource/datatype/) under "sleepphase". 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