Sleep

So I haven't been able to sleep for a few weeks now... Does anyone have any ideas of how to sleep through the night and be able to wake up in the mornings?? I've been sleeping but I can't wake myself up and it's like I only sleep in the mornings because I'm waking up like 3 times a night until 4 am but then I can't seem to wake myself up out of these crappy nightmares. If anyone has ANY suggestions please let me know.... I need some freakin sleep!!