Struggling massively with Predisilone insomnia- need help.

I’m in my my second week of steroids and have tapered down to 35mg but this week I have struggled with sleep massively. I’ve slept 16 hours since Sunday and each night that goes by I’m sleeping less. Either I’m struggling to fall asleep or I go too sleep and wake after 2-3 hours. I haven’t been drinking caffeine, tried melatonin and promethezine. I’ve been on steroids before but never have I had sleep issues this badly.