@abae Hi there, sorry to hear you have been having these issues, must be awful for you.
I had the same for a time. I learnt a technique where you just think positive thoughts and memories before I went to sleep and looked at photographs of happy times. It doesn’t necessarily have to relate to those you have lost, just happy memories in general, try to train yourself to do so.
It’s easier said than done but it helped me. Also try and head out on your own (if possible in the current circumstances), you need to have some head space, so just head to a random place or destination and just walk and think for a few hours. Its very soothing and liberating; it can be detrimental at times to be surrounded by so many things that are connected to them, That worked fantastically for me and still does to this day, especially if you can get away for a few days on your own.
Sincerely hope this helps. I have prayed for you to have some restful sleep, bless you.