You are downloading the Sleep XAP file v220.127.116.11 for Windows Phone. Sleep is a free and useful Health & Fitness app: *Version 1.8.2 Bug Fixes - Hopefully supporting Lumia 535 users and similar resolution devices now. SD card install still off the table for ... You can now download the offline XAP file to install & try it.
Download Locations for Sleep 18.104.22.168 XAP file
Important Notice: Now Due To Unspecified Limitations, You Can Not Use The Offline XAP File To Install It Any More.
To try to install it manually from an SD card, you should choose one of the server location above to get the offline Sleep XAP file, move the file to your phone's SD card and then tap 'Install local apps' in the phone's App list.