I can not get to sleep at night AT ALL?!

I can not get to sleep at night AT ALL?

I am 15 and lately (for the past two months) I can't sleep AT ALL during the day. I don't drink caffeine, I get plenty of exercise, and have a quiet room but I can't get to sleep until 6 A.M. and don't wake up till 3 p.m. or sometimes I don't sleep at all! I'm not depressed or have any other physiological problems (no bad dreams etc.) but I just can't sleep! I feel tired but when I lay down I can't get to sleep. Yesterday I lied awake for 12 hrs trying to get to sleep before I gave up. Normally, because It's summer, I wouldn't worry but I'm going on vacation Friday and I have to be able to go to sleep early and wake up early.

Any suggestions on how to get to sleep or maybe why I can't sleep?

i strongly suggest valerian root. it's great at relieving stress and tension! you can get it over the counter and it's a great sleep aid! if you have one of those "racing minds" or "i can't turn my head off no matter how tired i am" then this will definitely help. you can find at your local grocery store in the pharmacy or herbal remedy section. start off taking 500-1000mgs, 30-45 minutes before you go to bed. now you can get this stuff in capsule form and it's 100% safe (my whole family has been taking it for years and our family doctor actually recommended it) however the only downside is that the more potent the brand your taking the stronger the smell. and this stuff smells AWFUL! but it's worth it. within 5-7 days you should notice a definite change in your sleep.

WARNING! i strongly do not suggest that you take Tylenol PM and booze, in any form or combination. the main ingredient in Tylenol PM and Advil pm, or benadryl for that matter is diphenhydramine. here's what happens when you take it:
You can walk into a drugstore and choose from an array of sleep aids, offered without prescription. The main ingredient of over-the-counter sleeping pills is an antihistamine. Antihistamines are generally taken for allergies, but also make you feel very sleepy. Common over-the-counter sleep medications are Sleep-Eze, Sominex, Nytol, and Unison; they contain antihistamines such as:

diphenhydramine hydrochloride,
diphenhydramine citrate, or
doxylamine succinate.
In general, over-the-counter sleep medications are not a good choice because they:

Are not intended for long-term use.
Interfere with mental alertness during the day, so you should avoid driving and other similar tasks. You may also be at risk for falling asleep
Reduce the quality of your sleep by reducing time you spend in deep sleep.
Use over-the-counter sleep medications only for transient or short-term insomnia and in conjunction with changes to your sleeping habits. Be sure to pay attention to your body’s physical response to these sleep medications.

i hope this helps you out!