Can Pramolan cause waking up at night?

Mom (76 years old) has been taking Pramolan in the evening for 10 days9. A small dose prescribed by a neurologist – for neurosis. He takes his medication at 7 p.m., but has had serious sleep problems ever since. He falls asleep quickly, but wakes up after 2-4 hours and can't sleep anymore. Could this be an effect of this drug? Is it better to move the use to the morning?