Yep! Awakening from ANY length of sleep without feeling restored is very familiar... And sleeping 36 hours straight is a periodic occurance that is a requirement in my life. I think the ability to arouse has gotten better but it seems to have coincided with shortening my work week to 12 hours Tuesday, 6 hours Wednesday, 12 hours Thursday (I own my own medical practice). But I still have very little energy for anything other than work. On days that i don't see patients, I don't schedule anything before 11 AM because i am likely to sleep until 10. If I don't have anything on my schedule, I can easily sleep past Noon and feel like I slept no more than on the days when i have to get up for work at 6:45.
I also have cataplexy attacks that last for up to 3 hours and have only once occurred on a day that I had patients scheduled. I feel like I just hold it together for those 3 days and then sleep to catch up.