How to make myself sleep better?

Now as I'm writing I'm super duper sleepy. Eyes too tired to nearly close up. Lately I have a problem...which I don't sleep soundly. First hard to get into sleep even how tired I am. Secondly if I got wake up by some sound even a soft one and I will get awake and even harder to get back to sleep. My brain is like always functioning by thinking many stuffs. I get tired next day frequently. What happened? Anyway to make myself more relax and sleep more soundly?? I need it :(

I was annoyed by who disturb me from sleep. Especially those call me in the midnight at 2ish. damn...so hard to get back to sleep and especially u need it more. And during weekend if want to sleep longer also got woke by calls or sms. duh... even now wanna nap in the office also got disturb by ppl! all admins out to lunch and no one open the door...how come those ppl never thought of lunch time the person u r looking for will go out lunch meh?? I am super annoyed now...whoever near me I will marah...can't help because lack of sleep mar.