hey therearemiracles!
I had the same thing when I first started the Canasa, I'd get a bit dizzy and wanted to take a nap as it totally wiped me out... I think I even posted a couple of years ago about being wiped out from Canasa.... I'd definately take it at night if you only have to use it once a day. I bet that would help TONS and you'd feel fine in the am most likely. I did notice that after using it for a few weeks that the dizzyness and tiredness went away and it didn't bother me at all then....
Good luck and I hope you figure something out that works for you :)