My mom thinks I'm spending the night with a friend but...?

Well give her the number of the friend she thinks you're spending the night with and then call that friend and tell her to lie for you. Ooor you could ask that friend to borrow the phone for the night so when the mom calls the number your friends you're sneaking around with can answer and pretend to be the girl your mom thinks your spending the night with. You really shouldn't do this though and if you get caught you can kiss any future sleep-overs goodbye...

If your mom is ringing to check if you're ok, give her your mobile number (if you have one). If not, give her the house number of where your actually staying and when the phone rings at around 6, try answer it yourself. I know this is very tricky, so its best if you have a mobile.

I got some news for you. There is a huge human trafficking scam where people become your friend, get you to lie to your parents about where you are staying the night, and take you off to a foreign country to be sold as a sex worker. Don't fall for it, this person is not your friend. They commonly use phrases like "this is going to be so fun", or "C'mon just this once, your parents won't find out". Hurry call the authorities and report this criminal.

just tell your mum the truth your being stupid and immature

she may not like this friend but by lying to your mother your abusing her trust in you not to mention the fact that if anything were to happen to you or to your mum while you were at this other friends house nobody would know where you were to contact you

so just be HONEST even if it means you being told off for lying in the first place

Say that my friend said that she/he doesn't want you to have her number untill she is sure she can trust you.