I am a huge night owl and every now and then go through insomnia phases. I am going through one right now, it has lasted a few weeks. I don't get to sleep until 3am but get up at my normal time. I might be tired, but once nighttime rolls around again I am wide awake. I get like this when I'm excited or anxious about things going on.

I found that when I sleep in our guest bed all alone which is super comfortable I fall asleep pretty much immediately, so I use that as a last resort sometimes.