Uggghhh is all i can say

I need sleep and i need it bad but it just wont happen anymore.
I work 3 nights a week, and have never been one of these people that came home slept all day, i always woke up 4 hrs after id gone to bed so i get up, do dinner for the evening, potter then go back to bed for 3 hrs or so. It worked for me,and i was catching up on my sleep on nights off.
yet now it doesn't matter if im trying to sleep day or night about 2 hrs after ive fallen asleep i wake up, then continue to wake up on and off.
ive gotten to the point that i feel totally exhausted today, you know when your tired and you
just feel it, thats me

My sleep/ work pattern is i work sun,mon and wed, so tues and thurs i always feel tired cos i have 4 hr sleep after work then an hour later on so i can sleep at night. so wed morn,fri sat sun i expect to feel normal(if there is such a thing lol)
Now i read through various sleep threads on here, and today i have started on starflower oil for my flushes ( they dont help the sleep either) but was wondering if anyone has any ideas if i take night kalms will it work with daytime sleeping? and will i be able to switch to taking it at night when im on nights off
i know that might be an odd question but id rather not take it in the day then feel awful all night and vice versa.
I honestly dont think ive made much sense but im hoping someone will grasp what im trying to say lol
Ali