Hello !
Thank you for the question on HCM! I understand your concern.
In my opinion the symptoms you have may be related to a sleep problem . You have been taking Ambian before, so you have had troubles with sleeping before. The waking up is also part of the sleep problem. I would like to know if you have 
nightmares during sleep, or any unpleasant feeling like 
paralysis when going to sleep.
But the sweating is not very normal. Have you measured your body temperature when you get hot ? A possible infection can be associated with these symptoms, but not very consistent as your symptoms are only during sleep. 
An 
Epilepsy would also be a possible diagnosis . 
I would recommend you to have a full blood work and an EEG to rule out these diagnosis. 
In the meantime I would suggest trying 
ambien for a short period before sleeping time . I think it will help you . 
Hope to have been helpful!
Thank you for using HCM! 
Best wishes Dr. Abaz Quka