As PH advances and your spouse struggles more, fatigue worsens, and more sleep is common. It takes a lot of unconscious energy to breath. This is especially true when breathing is labored to the point that you're using all the accessory muscles (chest, abdomen, diaphragm) breath. Your spouse's appetite is probably pretty poor too. At this point, you probably need to plan your schedule around what your spouse is able to participate in. His/her body is calling the shots now.