eSleepy is a nightwear that can measure daily sleep by attaching a sleep measurement sensor and a removable rechargeable Hab to the wear. Since the sensor is attached to the nightwear, it does not adhere to the skin and does not feel comfortable to wear. For nightwear, remove the detachable Hab and machine washable. * Please avoid using a dryer. ●What you need to prepare　 ・ Your own smartphone * iPhone: iOS 12, iPhone 5S or later, Android: Android 7.0 or later ・Micro USB cable + USB AC adapter (used for charging)　 ● In order to use sleep measurement, a dedicated app "e-skin Sleep" is required. Please download, install and use it on your smartphone. There is no charge to download and use the app. Communication charges will be borne by the user. ・ With the smartphone app (free), you can know your daily sleep and receive weekly coaching. ● What can be measured: sleep time, sleep stage (REM sleep/light sleep/deep sleep), temperature on clothes.　〇 Sleep score (daily) Analyzes sleep data and displays the score.　〇 Sleep advice (once a week) Analyzes sleep data for 1 week (4 days or more) and displays advice.