I did it. I slept over 30 hours straight. (Well, except for getting up to pee.)
With this "chronic fatigue" that I have been experiencing I keep telling people that I'm sure I could sleep for 24 hours if I didn't have to get up and feed the dogs and cats. Now I know that's true. The dogs and cats had plenty of food and water, and I'm having a three-day weekend, so I decided to sleep the whole first day. I went to bed Saturday night and slept until Monday morning.
I don't recommend it.
It was no problem sleeping. I never once woke up and felt like I'd had enough sleep, so I'd just get up and use the bathroom when I had to and then go back to sleep. That is the essence of this affliction. I never feel like I've gotten enough sleep.
I got up at 9:00 Monday morning and I felt lousy. I suppose it was the lack of food and water, mainly. I felt like I was only about 75% there. It took some time before I felt normal. About four or five hours. I ate, drank, watched TV, got on the computer. Now it's just about 3:00 p.m. and I feel fine. I've just had an energy shot ("5-hour energy" shot) and I'm going to go out in a minute and mow the lawn.
Incidently, I could have slept longer.