Insomnia

I don't know what it is, but I haven't been able to sleep on a normal schedule for over 3 weeks now (I guess around the same time I found out about DHs MFI). It's really starting to wear me down. I took NyQuil 2 of those nights because I was sick, but it didn't really help. Either I finally fall asleep around 330a and waste the next day sleeping, or I only get 2 hrs of sleep and spend the day looking like a zombie with no energy to do anything.