I just started taking Lithium about 2 day's ago staring at 150mg then 300mg, I'm bipolar type1 mixed episode's, here's my question, as the mg increase's, do the severity of poss. side effect's increase as well, and is this med. supposed to help with sleep, i haven't slept since i started taking it, and came off the serequal xr due to side effect's, i'd like to know what i can possibly expect from this medicine.