Try this:
The idea is to tone down mind and body activities hours before sleep so you will get to sleep easier...
Some useful steps:
1. Drink less coffee, tea or any other drinks that contain caffeine, especially after later part of afternoon.
2. Try going to bed at the same time every night.
3. Avoid alcoholic drinks after evening time as alcoholic drinks may cause early morning wakefulness and may wake you up after your sleep.
4. Ensure your sleeping environment is suitable for sleeping (not too noisy, not too bright, not too cold, bed not uncomfortable)
5. Avoid heavy meals hours prior to sleep.
6. Stop all mind-stimulating activities 1 hour before going to bed (activities like reading research papers, reading mystery solving books, doing your school work, solving a complicated Maths question, watching your computer, watching TV, etc)
7. Half an hour before bed, take a warm bath. Then drink a cup of WARM milk.
8. As you lie on bed, take a deep breath and as you breath out, slowly, imagine you have abandoned your body. Imagine that your body slowly 'sinks' into your bed and become 'blended' into the bed. As you are imagining, take another deep breath and count 1. * As you breath out, slowly, now imagine your body is like water ripples spreading out, slowly. Take deep breath again and count 2 and repeat the process (from the place i marked with a *). Start counting from 1 again when you reach 9 or any number you prefer...
Hope this help. Email me if you have queries.