I tend to think too much at night and i can't sleep early. whatshould i do?

Insomnia: Insomnia may be caused by multiple conditions. Disrupted sleeping cycle by changing sleeping and waking up hours (shift work sleeping disorder) or hyperactive states (bipolar, adhd, drug abuse) or depression may be common reasons for that problem. Anxiety problems (generalized anxiety disorder, ptsd) can be responsible too. Breathjng disorders like COPD or sleep apnea can contribute.

Relaxation technique: Need to learn to clear your mind to sleep. Learning a simple meditation technique, such as deep breathing can be helpful develop a bedtime routine--warm bath, no tv in bedroom. Don't use computer 1 hr before bed. Try melatonin cr 3mg 1/2 hour before bed. More physicial exercise is a good stress reliever--which leads to better sleep. Journaling--writing down what worrying you- in am daily can help.

Good sleep hygiene: Set a goal! if you want to get up at around 7am, and want to sleep 7-8 hours, then don't sleep-in. Get up at 7am and no nap during day. Then try to go to bed 10-11pm..It will be hard at first, but be patient! it may take 1-2 wks to get used to. Avoid stimulant (caffeine etc) use after 3pm n don't exercise too late. Lower the light, relaxation/reading before bed. May need anxiety med. Good luck..

Early sleeplessness: You answered your own question that you think too much at night. Anxiety can be the reason. Also you are 50 years female, may be going through premenopausal phase with decrease levels of hormones. You didn't give much of medical, drug, dietary, social, psychiatric history. Please see your doctor for thorough insomnia evaluation.