One of my relatives has been sleeping on average 5-6 hours a day for past 10-15 years. She would sleep 3-4 hours a night with short naps during the day and then

One of my relatives has been sleeping on average 5-6 hours a day for past 10-15 years. She would sleep 3-4 hours a night with short naps during the day and then would have have a full 7-9 night sleep every few days. No health problems, absolutely functional person. Though she is still majorily concerned about her "lack of sleep" and thinks it's something that needs to be "fixed".