Why every night i can't sleep even if i try i just lay down in my bed for like 2 to 4 hours and then i finally i fall to asleep?

Many causes: Poor sleep habits such as spending too much time in bed or going to bed at different times on different days can cause difficulty with sleep. So can anxiety, noise, light in the bedroom. Improving sleep habits by going to bed at the same time every night, getting up every morning about 7 hours later whether or not you slept well, and avoiding naps, might help.

Better Sleep: Ensuring proper sleep hygiene is important: fix a bedtime and an awakening time avoid napping during the day avoid alcohol 4-6 hours before bedtime avoid caffeine 4-6 hours before bedtime avoid heavy, spicy, or sugary foods 4-6 hours before bedtime exercise regularly, but not right before bed.