Benzos are harder to tolerate as we age. Or if your kidney functions are changing.(this happens with the elderly).

Ativan is a moderate acting one. Xanax has the shortest half life,
Ativan is next as moderate, Valium is long, Klonopin the longest.
(this does not include the sleeping types, Temazepam and
Dalmane).

So if you are having some issues with sedation, either cut the ativan in 1/2 or cut out that night time dose entirely.

Xanax has the fastest onset, orally and briefest active time.
Ativan is longer acting and therefore used in institutions and hospitals more often for this reason.

You might mention this to your doctor... as a dosage adjustment may be in order. And perhaps some kidney tests too, to check your clearance rates.