Sneak some snacks into the room. Just a few snacks (salty, sugary snacks are best) and a bottle of any drink would be perfect. Try to get sugary beverages such as soda or juice. The drinks don’t have to be cold. You might want to get some water too. If you are going to get on the computer, turn it on before going to bed, because it makes noise when it turns on. Just ensure your speaker volume is low (or turned off).
Don’t snore unless you are known to snore. It helps to pull your blanket over your face to save half the trouble of keeping a straight relaxed face. Consider sleeping with the radio on to give you cover. If you accidentally make a sudden noise, it’ll be blamed on the radio.
Use headphones or earphones for electronics. Putting earphones/headphones in your laptop/computer will keep things quiet.
If you are going to text, put the phone’s volume on silent or vibrate. This will make it less likely that your phone wakes up your parents.