It is common, anticipatory anxiety...and I know, been there. It is something, as others have said, that you have to "make" yourself do until the feeling/experience changes...be careful, do give yourself 'special' time and attention but make it a regular, scheduled, activity/time. I was so bad years ago when I went to nursing school that, in the end, I only knew I graduated with honors by reading it in the newspaper, don't think I slept more than 2hrs a night those years, it was terrible but needed to be done....lately I am on edge totally because I am about to make a major change in my life---nights are bad (anticipating what I should/need to do the next day), morning are full of dread, (should I get up Now????)...and I will end up doing much at the last minute....
Do you have a doc? pdoc? health provider? Call and talk to them about the sleep issue, it may help to have something to take for a short while to get rest, and decrease the fears of the next day coming on.
Also, I found regular exercise really helps. (something I am not doing now but need to resume)