In sleep mode, time and sleep icon as well as a summary are visible on the screen of the iHealth Edge.
If you wake up during the night, you can check the time on your iHealth Edge. Make a firm rotation of your wrist to "wake up" the iHealth Edge. The time and sleep icone are displayed for 4 seconds and a report of your sleep done so far is displayed for 3 seconds.
*credit to Sylvain of iHealth Labs EU