Tampons are generally used for 2-6 hours, with a maximum of 8 hours. People sleep for almost eight hours at night, so using a cottpon at night is not a problem. You just need to change a new cottpon before bed and when you get up, change one in time.However, sanitary napkins are not recommended for people who sleep for more than eight hours. How to use tampon: 1. Choose the right tampon according to your menstrual flow. 2. Wash your hands before use. 3. Remove the tampon from the package and place the inner tube of the tampon inside your body, about a few inches, not too deep, making sure your hands can reach the outer tube. 4. Continue pushing the inner tube forward to push the tampon into the vagina and then remove the catheter (outer and inner tube) together. 5. Place the cotton thread on the end of the tampon to in order to remove the outer vaginal. Health tips: In summary, you should have some knowledge of the night tampons. If you have not slept for more than 8 hours a night, you can use it.But if you sleep for more than 8 hours, it is recommended to use a sanitary napkin.