On a regular weekend you might want to continue your sleep analysis but skip the alarm. You can turn off the alarm on the alarm tab (the bell at the top left corner). Under Settings -> Weekend you can mark one or more weekdays, on these days the alarm is going to be off by default.
This feature is yet not available for Android users. But you can choose in the upper Left Corner when you star the alarm if you want to have “Only Analysis”. That means that you will not have a wakeup alarm.