That happened to me the first time I was on it but I was also on sleep meds to help me get used to a CPAP, thankfully I was on a heart monitor and a nurse had to shake the hell outta me to wake me up!
I'm not using sleep meds anymore so when we tried it last fall, BP shot straight up, ended up in the ER(got to flirt with a damn cute doctor) and stopped taking them because I never had a good reaction to metoporal. Then dummy puts me on them again, same results.
A pharmacist friend told me that anyone can have any type of reaction to any meds, no matter how mild they are. My advice, make friends with a pharmacist.