I sympathise with your plight. You have done well to have stuck with the program for as long as you have.
Have you tried contacting the Centerpointe support team. They will be able to advise you and believe me they will not give you the hard sell.
The tiredness and falling asleep is an expected sign of overwhelm. I have experienced this but in my case for no more than two or three weeks.
At this stage I definetly would not recommend buying the advanced levels until you have satisfactorily made it through Awakening Prologue. Again I would contact the support team.
Good Luck.