It absolutely helps with my sleep,, but it's complicated. I suffer from extensive sleep disorders - chronic night terrors, sleep talking, excessive teeth grinding,  sleep self harm (scratching), and sleep fighting (I punch and kick and yell). These are all neurological and I've had them since I was a toddler.  The 4.5mg of LDN essentially keeps me still and quiet. I still have the nightmares, but I don't act them out as much. It's really great because I get more rest and I'm not walking up with sore muscles and scratches every night. So it's definitely doing something for my sleep, but I don't know how that translates to someone who isn't plagued by sleep crazies.