its not good for you. the reason why you bleed is because your body is getting rid of things it doesnt need that are harmful for you body if they stay inside too long. this is why it is especially dangerous to wear tampons for over 8 hours. truthfully i think over 6 is pushing it but its your choice. if you plan on only sleeping 8 hours then it should be ok. but there is always a risk. TSS or toxic shock syndrome
can be caused by tampons that stay in too long. this is a life-threatening syndrome that can potentially lead to death. so it is your choice and your risk. but i suggest you dont. just use a pad and frequently change your tampons.