Insomnia
"In my opinion, mirtazapine makes me fall asleep quicker, but quetiapine makes me sleep for more hours straight on end. 
Overall I think 25/50 mg Seroquel/quetiapine IR is the best sleepaid out there. Even after months or years of continous use, it doesnt loose its strength and is still nowhere near as addictive as benzodiazepines or barbitrates, while still being sedative."