What should i do if i have trouble falling asleep and staying asleep?

Identify reasons: If you can identify why you have trouble sleeping (anxiety, pain, etc.) then you correct the problem. I'd encourage you to read about proper sleep hygiene and keep a 2 week sleep diary. Examples are online that you can google.

Talk to your doctor: Talk about this with your doctor. This can be a sign or depression and many other things.

Sleep Hygiene is Key: Retire & rise same time each day. Keep bedroom dark & cool & use only for sex & sleep. Turn off tv. No naps. Exercise regularly but not in late evening. No caffeine for 6 hrs & no alcohol or tobacco w/i 2 hrs of sleep. Keep dinner moderate sized & finish at least 2 to 3 hrs before sleep. Can try warm milk, Chamomile tea or melatonin along w light reading, warm bath or lavender scent.