May I use HappyWakeUp ArousalClock during day-time for a day-time nap?
Yes, the medically recommended duration for a day-time nap is 20-30 minutes to avoid too deep sleep. This is achieved by setting the alarm delay in HappyWakeUp clock to 26-30 minutes. Now you should have a 20-25 minutes nap. Note that 26 minutes is the shortest duration of HappyWakeUp clock function!