Sims 4 unresponsive at night

Weird as it sounds my sims game runs fine in the day but almost the same time in game, the evening, as my sim sleeps the game becomes unresponsive. 

I play with mods and tested all of them, deleted anything broken or corrupted, updated my drivers and cleared all the cache, even repaired my game and yet it’s still happening. 

before the update for the latest event things ran fine and now I can’t play my game at all, only thing I haven’t done is try a fresh save, my sim currently resides in copperdale and I’ve noticed npcs are spawning at a rapid rate. Hoping this can be fixed