Vyshaan's Nightmare

you target a sleeping creature you cause nightmares to enter there sleep.
the target must make a Intellect saving throw or take 1d8 psychic damage on a failed save or half on successful one.
after the spell is done the target always wakes up.

when you cast this spell using a higher spell slot the lv 1 then the damage is increased by 1d8 for each spell slot above the first