Sims "teleport" out of bed, and also they become invisible

i have been getting this issue lastly and i am not sure if its from the new patch or something playing up, what's happening is that when i send my sim to bed to sleep, they only sleep for a certain amount of hours then, teleport out of their bed it roughly happens twice every night. I don't know if it's the lot that i am living on or a bug, i have sent my 3 sims on holiday and they sleep all night. Also the invisible issue again i don't know if it's the lot or a bug or something but my sims randomly become invisible and the only way to get them back is the resetsim cheat but it happens more than once with every sim and pet then goes back to normal :/

i'm confused