Barb is right on the money. I can tell you that without sleep/naps you will become exhausted. Exhaustion comes on easily, stress brings on exhaustion and more exaggerated symptoms including irritability, cognitive decline and depression. Overstimulation also becomes a bigger issue. I have been encouraged to be active but the fatigue is always there. It just gets worse with activity. Stress just adds to the load. I can't tell you the number of times a day I have to lay down. Some days aren't as bad as others and on occasion their is a good day or two. I have learned to stop before activities, nap etc. then go then nap if needed.
Sleep at night has become very disrupted. I am on a cpap and found out my oxygen levels dropped dramatically at night and rem sleep was almost non existent. Supplemental oxygen at night did help to a degree. Also research has shown that people with HD have problems with their Circadian Rhythms being disrupted.
Hope this helps.
Mike