Everytime I'm inspired to write some music it's at night. I don't think I've ever had daytime inspiration. Things always get in the way during the day - phonecalls, work, neighbors, eating . I'm sure this is the same for a lot of musicians here.
I can generally remember where I was and what I was feeling for all of my finished tracks.
My happiness often coincides with the completion of a track. This really sucks.
It's become a lot more difficult to write music I'm happy with plus it takes a million times longer than it used to. In the first 5 years of music making, I could stay up until the mid-morning, which would often be 10+ hours and finish a 7-10 min piece. Now, it can take me months to complete 1 min intro.