Help! I cant sleep...?!?

Okayy well this has been occuring barely last mondayy. It became impossible for me to fall asleep at night..i have been contantly sleeping around 3 or 4 in the morning and waking up around 8. I dont drink coffee so that cant be the problem. I also have constant headaches part of my brain. I dont do much exercise anymore since im in summer vacations. Well, i drink alot of soda but i always did so i dont think thats the problem. Also, i just want to know whats going on.. help. I sleep durin the afternoon or i just feel like not doing anything anymore...Ughhh