There is currently no pause option implemented, also I am not planning to implement it in the near future. I know it would be handy sometimes, but the way I record and store the data would make it tricky I guess. It means that you have been in sleep phases shorter than 30 minutes for more than 1h20m in total. I know it does not make much sense or tell you much I am already working on an improvement which will tell you how long you have been awake, in light sleep and in deep sleep. Have a look in the extras-devel version in a few days!