sleeping over

so i’m 14 call me young idc i’ve been dating my boyfriend for nearly a year and a half i trust him fully i chance infront of him i do stuff with him i’m comfortable with his family he’s comfortable with mine but how do i convince my mum to let him sleep over and ik she’s worried that we will have sex but really i just wanna feel close to him i feel like sleeping in the same bed so close is such a great feeling and i just wanna snuggle up to him all night i’ve tried everything to get her to let him stay does anyone have any tips or tricks or stories :)))) much appreciated