From David Pomerenke on 2018/02/15 17:33:12 +0000
Align the sleep data in the heat map by time, just as it is in the diagram visualization in the app. Allow switching between the currently implemented view (which is useful for comparing sleep length) and the new view (which is useful for comparing the time of going to bed and waking up). Allow independent x- and y-zooming. Also allow that in the app: It allows better comparison of sleep patterns over several weeks or months. 
Copied from original feature request: http://urbandroid.uservoice.com/forums/264867-sleep-as-android/suggestions/33338797-improve-heatmap-in-the-sleep-cloud