Lately, I've found that I can't get a decent night's sleep without taking .5 mg of lorazepam (without it, I have LOTS of really vivid, bizarre dreams and wake up really tired and disoriented). However, I'm worried that I'll become dependent (again) if I take it for too long. I normally only take it at night, though every once in a while I'll take one during the day when I'm feeling really bad. Is it possible to build up tolerance when taking such a low daily dosage?