Maybe your life is TOO relaxed. Do you get out much? If you don't try going out and doing something. Stimulate your mind by doing things you wouldn't normally do. Also try working out. At first working out will make you feel more tired but as you continue it should make you feel more energetic. If you need a way to stimulate your mind at home get a puzzle video game or anything that causes you to think a lot. Brain Age for the DS would probably be best for this. Lumines, Tetris, or other like games are ok but dont compare to Brain Age as far as brain stimulation because after getting to used to those it becomes a brain relaxer. In short what you need is either physical or mental stimulation or even maybe both. A too constant routine or lack of stimulation causes sleepiness, restlessness, a constant feeling of enclosure, dissipating complex thought capability, poor self image, carelessness, and/or unseen causes to stress or boredom. People react in different ways to this. Thats why some of those side effects contradict each other.
If you are a teen, you need at least 8 hrs of sleep every night. Try turning off the TV, phones, computer, any other sound devices about an hour before you go to bed. You might go to a doctor and explain this to him/her and ask for advice. If you can't afford one, there might be a free clinic in your area. You could be depressed, or one of many things.
Your mind & body may be out of sync. Your body is tired & ready to rest, but your mind is wide awake, keeping thoughts active. Some ideas that can help are a few minutes of meditation, some easy reading, low classical music, calling a friend to chat, turning off the TV. Or tidy a small mess that's nagging you. (Messy surroundings are a big stressor, conscious or not.) Re. stress: Lying awake to solve problems when you're tired rarely works. You make your best decisions & handle problems better when you're rested. Since the concern will likely still be there in the morning, hopefully less daunting, give yourself permission to sleep in order to deal with things productively, tomorrow. But you have to be willing to let yourself off the hook for a few hours. No other sleep cure or solution works better than your own resolve.