I have cfs and am only able to sleep in short, intense bursts. When I wake up, I am usually drenched with sweat. Why am I sweating so much?

Talk to your doctor. Interesting question. It could be your medications. It could also be endocrine or neurological in nature. I would speak with your doctor and see what recommendations are appropriate in your case.
Several possible . Sweating is a physiological activity with many different manifestations, causes, and purposes. Hormonal, metabolic, emotional, pharmacologic triggers and many more may be responsible and it is difficult to explain your particular cause without further investigations.