2. The most common side effects of facemask are pressure related, such as redness, irritation over the mask's borders. To decrease possible skin irritation and abrasions, subjects will be using a tent during the night and high flow nasal cannula during the day for breakfast, lunch and dinner. Additionally they will be able to choose whether to use high-flow nasal cannula or the facemask during the day at any time as an alternative to the facemask.