My father age 72 is having blood pressure and diabetic,from some days he is complaining that he is not having good sleep,then my doctor prescribed him zolfresh 5 which i divide it to half and give him 2.5 mg he slept well that night in my next visit again I told the doctor he prescribed me ativan 1 and said it's more safe for him. So yesterday night I gave him ativan 1 mg around 8pm he is telling me that he slept around 12 last night, and woke up at 5 ,now again morning he is sleeping,feels like more sleepy , should I gave it half or before dinner pls tell