My SIL.....does work, but then takes a 3 hour nap after work every day, and the days she has off she sleeps even more. /QUOTE]
OT but is it possible that your SIL has sleep apnea? People with sleep apnea although they appear to sleep enough, do not get quality sleep. They sleep oxygen deprived, get frequent headaches, have daytime sleepiness &/or try to catch up by napping often, among other things. Loud snoring & gasping for air during sleep are also symptoms. The only way to know for sure is to have a sleep study.
Ditto for your sister, Marina...you never know