Why do I wake up in the middle of the night?

my brother has the same problem hes scared of everything he is also 13 he sleeps under the kitchen table :( i know right i think you nees to go to a phycologist i think is what they are called my bro sure needs to see one but my mom doesnt belive anyways or get a night light i have to have one and im 15 and for noise get a fish tank or something that makes a low noice or hamster lol mine sure made noise! good luck