for some people it is and for others it isnt...only you and your own treatment providers (medical doctor, therapist, psychiatrist, psychologist.. what ever treatment providers you have) can say whether something is normal for you or not.

my suggestion is if this continues to bother you contact your treatment providers. they will be able to assess what is going on and tell you whether its normal or not for you, your health issues, your meds and what have you.