---
title: "Changes to Alertness period data (last 28 days)"
method: GET
path: "/v3/users/sleepwise/alertness"
---

# Changes to Alertness period data (last 28 days)

`GET /v3/users/sleepwise/alertness`

> Every recorded change to this operation, newest first.

## Timeline

Changed in 3 of 5 revisions.

- **2026-11-06** `18ce96365320`: 6 breaking
- **2026-02-07** `f197848bba31`: 2 info
- **2025-06-04** `5ef2cea678a2`: 1 info

## Changes

- **2026-11-06** `18ce96365320`: 6 breaking
  - the `items/hourly_data/items/end_time` response's property format changed from `date` to `date-time` for status `200`
  - the `items/hourly_data/items/start_time` response's property format changed from `date` to `date-time` for status `200`
  - the `items/period_end_time` response's property format changed from `date` to `date-time` for status `200`
  - the `items/period_start_time` response's property format changed from `date` to `date-time` for status `200`
  - the `items/sleep_period_end_time` response's property format changed from `date` to `date-time` for status `200`
  - the `items/sleep_period_start_time` response's property format changed from `date` to `date-time` for status `200`
- **2026-02-07** `f197848bba31`: 2 info
  - api tag `SleepWise™` added
  - api tag `SleepWise™ (Beta)` removed
- **2025-06-04** `5ef2cea678a2`: 1 info
  - endpoint added

---

[Operation](https://skmtc.dev/polar-com/apis/polar-accesslink-api/docs/v3/users/sleepwise/alertness/get.md) - [API](https://skmtc.dev/polar-com/apis/polar-accesslink-api.md) - [Page](https://skmtc.dev/polar-com/apis/polar-accesslink-api/changes/v3/users/sleepwise/alertness/get)