You need to tire yourself out physically and mentally. Enter bedroom only when you start yawning. Until then keep yourself Busy.
Next Steps
stop whatsapp Facebook etc 2 hours before sleeping. do not watch TV while preparing to sleep.
Health Tips
read books , play light music, do 45 minutes of exercise/running before 5 pm. eat less in night. visit doctor only after you have tried these tips. you need to have many weeks of sleeplessness before you are diagnosed with any sleep disorder . if you emotional issues please work with your family for support.